What do you mean by "going along with" ? Just that it sounds suspiciously like agreeing with an opinion, rather than accepting a feeling.

> confirm that they are indeed experiencing that emotion

This is not emotional validation; nobody wants to be told something they can decide for themselves. Instead, they want to hear that it is okay to feel said emotion. When venting to someone, one doesn't want to hear "I understand that you feel that way", they want to hear "I understand why you feel that way". The former is a dismissal (taking the guise of a validation) and the latter is a validation. "I don't get why you feel $EMOTION about this" is the ultimate emotional sucker punch of invalidation from an active listener even though it necessarily implies said confirmation that they feel $EMOTION.

> They're looking for people to share in that anger, sadness, or frustration and confirm that it's a valid response to the situation.

Notably, "sharing" the emotions is not the only way to validate them; I do not have to feel (or even understand) one's sadness for their sadness to be valid. The second part is the only thing they're looking for and it is very unlikely to be false given the appropriate context. From another comment, "the emotional response was valid for the circumstances" is accurate when one understands "the circumstances" to include the life experiences that cause them to have such an emotional response from something that doesn't trigger the same emotions in oneself.

> overreacting to everything and having unreasonable emotional reactions all the time

There are healthy avenues for expressing such emotions as well as unhealthy ones. Validating the emotional response to something is precisely what will allow the person feeling the emotions to calm down and decide on actions that will benefit their situation. If they are invalidated, they will instead spend effort seeking that validation.

> Just going along with it.

Well, if "it" is referring to behaviors and attitudes, then there's an obvious problem (in all likelihood) but that's also distinct from emotional validation. As I said in my other comment in this thread, one can logically say "it's okay to feel that way but you shouldn't think that". I strongly doubt that is the likes of the validation being complained about here. The negatives of the situation being described do not seem likely caused merely from emotional validation. And I would bet with near certainty that the partner they met who got them to choose healthy behaviors did so by first validating their emotions.

The emotional world is vast. From what I hear here, there is a collapsing of a couple things all under 'validation'.

Emotional processing, in my experience, is completely separate from action. I hear that your family member had her actions validated - what she decided to do.

An emotion itself can be complex, scary and counter-intuitive. In my experience, always valid - but that doesn't mean you have the right reasons. It's often very difficult to get the right environment to actively explore where an emotion is coming from - purely because of the reactions in other people - which try to suppress, deflect, minimize, etc.

Strangely, simply agreeing or validating someone's outcome is actually a way of minimizing or deflecting the scary expression. Let's not go deeper, let's not figure out where this is coming from - you just go with your gut and act.

Getting to the root of an emotion can come in waves and many iterations. It can be incredibly useful to try and completely unhook action from it.

I've had very strong emotions from events that were almost always "right emotion, wrong reason/story" and I've slowly corrected the 'why' multiple times over.

A lot of those corrections took removing people from my life that made it hard to feel or have access to those difficult emotions.

I wonder if you value that family member or just the idea of them. Value them only when they're 'stable'? Want to get in the muck with them to find where instability comes from? It's okay to not. It's less okay IMO to stay connected to someone you require change from. If you don't like behavior, say it and leave/create much space. Give them agency to choose, agency to fail, agency to be someone you don't like, agency to not be okay.

> They're looking for people to share in that anger, sadness, or frustration and confirm that it's a valid response to the situation.

Which is what the whole "empathy movement" of recent years seems to emphasize. The problem is that when empathy is unmoored from the objective good, this can become scandalous (not in the sense that it causes outrage, but in the older sense that it encourages evil). Not every response is a valid response. You must be able to identify whether something is good, you must refrain from actively enabling things that are bad, but you must discern whether to correct, and if so, how to correct. Not every problem is yours to correct. Busybodies think they are.

(N.b. the Catholic Church, drawing on ethical distinctions, makes distinctions between moral principle, the objectively moral status of particular acts in light of moral principles, and the pastoral needs of particular persons. So, e.g., while prostitution as a practice is roundly condemned as a matter of principle, particular prostitutes may be treated gently. This is especially true if he/she expresses remorse for the way he/she has lived his/her life (the parable of the prodigal son comes to mind).)