Well, let's break it down.

First, he's been through the whole diagnostic process multiple times, with multiple doctors. This includes psychiatry and psychology, as well as neurology. No diagnoses of anything that would excuse petty thievery as something outside of his control.

Second, the first time I beat his ass was after roughly thirty years of bullshit. A little longer tbh, but still. We aren't talking a recent change here. We're talking a pretty damn full lifetime of fuckery. Support was shown through all of that. The dude would pilfer some shit in an obvious way, and I'd just take it back, tell him to cut his shit, and try and figure out what the living fuck had him doing it. Every time, over decades.

Seriously, support has a limit. Even if it was something like schizophrenia (and I don't know how that many damn doctors would miss something like that), it reaches a point of absurdity.

And, once someone tells you they're going to beat your ass if you come to their house again, and you go back, that's on you. The first one, if you choose to ignore the decades of fuckery, you can blame on me if you like. I could have just removed him from my home using less intense force, but it's still force, and he was going to gtfo one way or another. But that second one, nope, dude needed his ass beat.

Then, no injuries beyond bruising. I trained in martial arts for pretty much all of the nineties and into the naughties. No broken bones, no internal injuries, no joints damaged. Minimum amount of force to get the job done and make sure he knew I wasn't joking or fucking around. I didn't explicitly say that in the original comment, but the dude was saying he'd walk back to his car. And his mom picked him up, and he drove her car. Obviously, a very limited use of force if you're whacking someone's ass with a stick and they can still drive.

I mean, ffs, I can't even count the number of times I tried to talk to the dude and figure put wtf was in his head. Nothing but outright denial, the same as when he's standing there with a fucking hamburger in his pocket saying he doesn't know what I'm talking about.

Yeah, I couldn't help reading this and feeling extremely sad for Ryan. If they're in their 50's-60's, the parents had tried to get him diagnosed as a kid in what, the 70's?!? I'm not sure what they're expectations are for people with a mental disorder, but it sounds like they're expecting a trope and someone halfway functional is completely fine.

There is apparently a childhood full of sexual deviancy, which was never properly addressed and caused more anxiety and strain on his relationships his entire adult life. Dude's stealing post-it notes and anything/everything regardless of value, that's kleptomania 101

Kleptomania (klep-toe-MAY-nee-uh) is a mental health disorder that involves repeatedly being unable to resist urges to steal items that you generally don't really need. Often the items stolen have little value and you could afford to buy them. Kleptomania is rare but can be a serious condition. It can cause much emotional pain to you and your loved ones — and even legal problems — if not treated.

Kleptomania is a type of impulse control disorder — a disorder that involves problems with emotional or behavioral self-control. If you have an impulse control disorder, you have difficulty resisting the temptation or powerful urge to perform an act that's excessive or harmful to you or someone else. (link)

He's doing these things, but I think the expectation is that he should "just stop" or "get over it". He's so out of control he can't even stop him self while in front of other people or performing dangerous sexual acts, this is a person who has been untreated and needed help for decades.