Re: Q Who? - What were Q's Motives?
I think he did the right thing for the wrong reason. Starfleet was all nice and comfortable, and Picard did have the air of, "We will be fine without your magical powers! We can handle ourselves!". I think this sort of arrogance pissed Q off, and he wanted to show them that they weren't the biggest bullies on the block.
"If it weren't for stupid, difficult races, there'd simply be no point to living."
Sometimes you just gotta roll the hard six- Bill Adama