I think that hand was well played. It's certainly ridiculous to play 52o from UTG, but that's what we can expect from the multitude of horrific players out there.

Why didn't he raise your turn bet? Because he's the same idiot that played 52o. Can't rationally explain the actions of crazy people.

With regards to the raise on the turn, I think that one could go either way. Personally, I probably would have raised also to test that bet. There are some legitimate hands he could've had - A5s, K5s, 55 - but you're right, the odds seemed slim. By raising, you give him the opportunity to fold, and if he goes all-in, then you could probably put him on the straight.

Glad your river card came so you could take that fool's money.