Hand 1: Bet river, and I like preflop.

Hand 2: I check/call too. Mainly because i can't bet/fold vs. this type of player, but also:
Because he's bad and agressive and did not raise the turn, I don't think he has 2pair or a set. It's either a flushdraw, a T or a PP. Betting when he has a FD or T is obviously no good. Versus a PP you may lose 1 bet if he checks behind. But it's also possible he blufs with his FD or bets his PP where you will gain 1 bet. (or checks behind his AA...)

So everything accumulated I think its +EV to c/c.