It's a common cognitive error called Moral Thought-Action Fusion. The idea is that thinking about an action implies a desire to perform the action. You will see these in other circumstances as well. One place it is commonly used is in describing non-religious moral systems that must form their moral bases without axioms from God. A non-religious person may form a considered position against murder, for instance, but the fact that they state the pros and cons before choosing against is considered evidence that they wanted to.
The core reasoning system here is probably moral intuitionism: if you have an explanation for why something is bad, it is not something you consider intuitively bad and consequently you must be wanting to do it.
I think I've seen it in online communities a lot more in the last couple of decades, and I suspect it's just a characteristic of the endless march of Eternal September.
To some extent I agree, but if someone is deep in the weeds of speculation, not just saying pros and cons of murder in general but also having drawn up lists of people with pros and cons of murdering each of them and possible ways of doing so, then that's starting to get a little suspicious. Perhaps not bad in itself, but suspicious.
Don't really agree here. The point against him is thinking in a very shallow way that stopping ad block means bringing in so much, which I guess is true in a certain basic level, but ignores how shitty that would contribute to making the internet.
And believe it or not, human behavior is such that something that is not even i in the space of possibilities is much less likely to occur that something that has been considered and rejected. It might have been rejected ow, but what the calculus changes?