So you'd rather people poison and destroy their own health just so that animals would not need to be killed?
Imagine telling a parent "yeah, it's ok if your kid gets very ill and has chronic diseases, but hey, the chickens will live!"
There are no studies I’m aware of where focusing on a plant-based diet makes you “very ill” and gives you “chronic diseases”. On the contrary, it’s not that hard to be healthier.
Meat, on the other hand, is linked to diseases. Especially red meat and cancer.
https://www.cancerresearchuk.org/about-cancer/causes-of-canc...
So your scenario is more like “imagine telling a parent ‘Give meat to your kid. They will get sick, unnecessarily kill animals (as we all know, kids hate animals, right?), and accelerate destroying the environment (who needs to live in a good environment, anyway, as long as there are burgers?)’”.
Are you saying that opting for a beyond burger patty instead of a beef patty is going to "poison and destroy" your health? That's a bit of a stretch no? Are they really any worse for you than a regular burger from a fast food joint or something?