In fact, it's a fair statement that I naively expect decent and humane behavior from those around me. The Christian in me naturally looks for the good in all of my fellow people. The software engineer in me, who deals all day with facts and data, naively expects truth and goodness. It is only when someone acts inappropriately or treats me badly that I would then be on guard about such a person.
Naturally, this being a world populated with all sorts of people, I have encountered people from time to time who have wronged me or those I care about in varying degrees. As a Christian, we're taught to turn the other cheek. The realist in me, however, loathes to naively do so once wronged. My sense of justice, in fact, tells me that what goes around comes around, and whoever does intentionally bad or evil things will at some point reap their return. This is where the concept of karma comes in. When you bring bad and do bad, you'll get bad back, and not in the "cool" sense of the word bad.
The irony for someone like me, who is inherently good and tries to be a good person, is that when someone wrongs me, I don't wish to see them intentionally wronged or harmed. I don't take pleasure in the needless suffering of others. I'm a live and let live kind of guy, and if we don't get along, I'd rather that you go your way in peace and I'll go mine.
What really blows my mind about karma, though, is that for folks that have truly wronged me in evil ways, through either deliberate intentions or blatant disregard for anyone's position but their own, I've seen karma come and cut the legs out from them and give them a strong taste of their own medicine. I won't go into details because I don't believe in airing others' dirty laundry so blatantly, but suffice it to say the volume of bad karma was definitely proportional to what I experienced.
By contrast, I've been on the good side of karma. I've experienced having someone pay for my toll at the bridge, or pay for my meal at the drive-through before. Talk about your rush of good feelings! Invariably I would end up doing something nice for someone else, passing the good vibes around, just because.
Now, one _could_ say that doing something nice for someone is trying to collect some good karma for yourself. But you see, that's not the way karma works. If you do something good because you think you're going to get something good in return, that's not so virtuous, is it. Truly good works are done just because they're good, and not because you're expecting payment or favors or privileges in return. Good deeds truly can be their own reward. And truth be told, the more often you do something good for someone without expecting anything in return, the more often good karma does genuinely come to smile on you. True story.