Serious question, do you actually think that if you distribute millions of small nuclear reactors to homeowners geographically spread out around all of North America, 0.000% of them will be dangerously mentally ill, criminally reckless or inclined to terrorist like activity? Based on the frequency and number of mass shooter type incidents, (or like, David Koresh and the Branch Davidians) this would be a very naive view.

It doesn't require a criminally minded 3rd party coming onto someone's "safe" property to do something horrible with a sawzall and/or oxy-acetylene cutting torch.