We can't know if what we are doing is good or bad, not in the grand scheme of things. But, it's not our job to. From our perspective it is important that our intentions are good. The consequences of our intentions and how they effect the future is God's (for lack of a better term) responsibility.

I don't think there is such a thing as a good or a bad person. There is simply people who have chosen either to try and do good, or not. But when it comes down to it, I think even the very best of us likely has a plethora of "bad choices" in our histories. In fact, it is making bad choices(or watching others do so) and observing the outcome of those choices that inspires us to want to make better ones. So in a sense, even a very bad choice is doing good in this world.