Interesting points you make here. It indeed doesn't seem to work & even make things worse.

People are how they are because of their past experiences, which doesn't make the things they do ok ofc. But they are still human beings who are miserable and are working that out on others. If they were happy they wouldn't try and hurt others.

Putting them together with people with even worse experiences only makes it worse imo.

The question then is how do we actually do help people like this f.e.?

How do we change people's mentality in general?

Maybe psychological help can help them, but only if they are open for it I guess...

No idea how to solve this issue...