On fusion: it's a neat theoretical possibility, but don't hold your breath. We've been a decade away from workable fusion for about fifty years now, and I don't expect that to change for another fifty. A better option is to make fission cleaner by recycling the spent fuel.
On reactors, well, the latest ones are designed with some very effective and completely passive backups. If you want to compare to, say, bridges, the latest reactors are something akin to bridges that stand only two feet off the ground. Sure, something might go wrong, but the damage afterward will be very minor. I won't say nothing bad can happen, but there is a pretty low maximum amount of bad. I'd be much more concerned with a maximum-security prison nearby than a reactor, or with a wind farm. Did you know wind turbines can explode?!? Tell that to the environmentalists.