The jury has found him not guilty, and that's a fact. Can't argue with that.
Can have personal feelings though (not relevant in law, and carrying no weight whatsoever) and my feelings rather tend towards feeling he's got away with it (which technically I suppose he has, being found not guilty)...
I imagine quite a lot of people who kill innocent victims, intentionally or just carelessly, live with guilt for the rest of their lives. That doesn't make a good ticking off in the police station the appropriate sanction for manslaughter.