I have a stepdaughter with schizophrenia, she trusts me more than her mom or dad since I wasn't part of her upbringing, so I've been able to do things like bring her to the emergency room when she thought everyone else was out to get her. But at some points help is not helpful - if your help is only hurting you and not doing much for him, you cannot fix that by trying to help. Wrecking your own life is irresponsible to yourself and to your wife.
I do know it's hard. Especially here where there is not much mental health funding and they end up in jail (though stepdaughter was calmer in jail for some reason, that is not a good answer). If he is stuck on violence, and crazy so he can't see his own responsibility in it, just keeps blaming everyone else, you can't fix that.
I agree with knives, love them.
Natural fermentation is a technology I love, that is pretty ancient. The way I make bread, it's leavened the same way as almost 15,000 years ago. Beer is like that too - it's commercial now but you can achieve it at home without the industrial tech.
Windshield wipers are so clever.