1. Yes, though they do not always possess enough clear or non-contradictory information to make those decisions.
2. Yes, but they lack the information (as above), but also have their political decisions filtered through a system that does not reflect political beliefs, and whose inner workings they don't really understand.
3. Most of the time. I can act out of bad information, stubbornness and spite, just like anyone else. Even if I make the proper decisions, I, like most people, don't always have the self-discipline to follow through with the decisions I make.