Yeah they make questionable calls for sure, A7 is unthinkably bad calling here. I probably muck JJ if i'm that BB! Why risk it when you have a 3.5k stack.. your gonna be in the money regardless, but if you lose, like he almost did, then your down to 1.5k!
Absolutley, I hate the BB's call here. Although as its a $1 game its not very suprising. Im sure that a lot of at people those stakes dont understand that they should tighten up when they have a good stack due to the flat payout stucture, they see an ace in their hand and refuse to fold even if it puts them at risk of getting knocked out.
It is good to have these players at the tables. The times that you have a decent stack you can sit back and watch them try to knock each other out and the times that you are short they can give you a timely double-up.