And hard labour, up at 7 etc will reinforce that sense of belonging. Them against society, you are in effect creating an army, with its own rules and values which will be alien to the rest of society.
If you want people to respect our society, you need to give them a stake in that society not create a parallel society with its own value system.
We lock up too many people, elsewhere in Europe they do the opposite and it works. Trouble is we don’t want it to work. We just want to punish and make them suffer and no matter how many times we get told it won’t work we will just scream and rant and demand tougher and harsher conditions because it makes us feel better. It’s an emotional based system, not a rational one.