Man's inanity to man

I always struggle with this. Why does God let bad things happen to good people? Over the years, I have come to believe that He lets us suffer the consequences of our vices, our ignorance, our meanness of spirit. There's a lot of that going around right now, if you hadn't noticed.
Cancer seems to be a scythe-bearing Death, cutting down people randomly, letting some survive while others don't. I got to thinking what in the world God could be telling us. Then I remembered.
We knowingly surround ourselves with toxins. We have soaps and detergents that are potentially much more dangerous than the germs they're supposed to kill. We buy houses with poison, plastic rugs, sprayed with more poison to protect them from spills. We let processors treat our food with chemicals, wrap it in plastics, then open it and cook it on pans that release toxins as the food cooks. We dump chemicals onto our precious yards, knowing full well that most of those chemicals will wash straight into the groundwater, even as we catch a quick drink from the hose. Our drinks - juices, alcohol, sodas, milk - all contain varying levels of poison. If we drink diet sodas, our bodies turn the sweetener into fomaldehyde in "acceptable" levels; at least the FDA assures it's safe.
If toxins aren't carcinogenic enough for you, we zap our foods in microwave ovens, then hold a microwave transmitter (yep, that's what a cell phone is) next to our brain most of the day. In the end, it's still crushingly sad when good people die of cancer. But we shouldn't claim we're surprised by it. Instead, we should be utterly shocked so many of us survive.