Just as you've probably heard so often, I don't really believe in bad people. Life is all about decisions, and I think people are led by illusions, which is common though, because we are are cheated one point or another. Whether it be the thought that money brings happiness, sex brings happiness, or whatever false leading drive that humans are fooled by. I think making bad decisions is relative though, everyone makes bad decisions, we can't deny it. It's the line that seperates those who commit serious threats and crims against humanity that the decision making process is really effected.
Every decision is made with a goal in sight, money.power.sex..love, but mostly money, whether we like to admitt it or not. We can't blaim humans, in general, for falling for this illusions, as we are all tempted by money everyday..it's almost necessary for our survival, or what we think we need to survive.
Emotions often lead to bad decisions, but outside stimuli often contribute one way or another..
Through and through, I think all bad decisions stem from a deep internal human desire and selfishness, that not everyone wants to and can admitt exists in them.