This problem goes pretty deep. Like, down to basic brain function and peoples epistemology. It is far easier for the brain to hang on to binary distinctions, to split things into good and bad. Even if a person looks at a list of 'pros' and 'cons' for making a decision, and decides a certain way is the best solution, they will adamantly refuse to admit or accept the notion that they agreed to bear those 'cons'. They will only admit (even internally to themselves) that they chose to pursue the 'pros'.
If most people were to look at safety only a bit differently, their world outlook would change substantially. If they realized that it is stupendously easy and simple for any of the multitudes of people they come into contact with on a daily basis to kill them, and that no police force in the world could possibly stop such a thing from happening if the person were to decide to do it with no warning, the initial response would probably be fear. But, upon further reflection, they might realize that despite the tremendous ease, despite what others might have gained at any point, it simply has never happened to them. What could possibly explain that? There are ex-convicts, unpleasant people, people with disturbed worldviews, psychopaths, and other 'bad people' everywhere and you've certainly been in contact with them quite regularly. And... you've been, and continue to be, safe.
While it is challenging to keep a human being alive, what with them having all sorts of needs, it is very easy to kill one. Someone walks up to you and pulls out a knife with a 2 inch tiny blade and simply presses it into your jugular and you will most likely die in a minute. Or you could get hit with a car, or something could be put into your food, or your house could be set on fire with you in it, there are innumerable methods that are all easy and entirely within the capability of any normal person. But, killing a human requires something else. It requires the willingness to kill. Almost no one has that. Military training is arduous and difficult because even giving this willingness to the average person is insanely hard to do (and they settle for simply ingraining killing as a reflex response since they have never actually accomplished manufacturing the actual will, so soldiers typically kill before their conscious mind can decide what to do, taking their will out of the equation, resulting in neurological damage that manifests as PTSD but that's another topic). To presume that even a "bad person" runs around with this willingness constantly within them is quite ludicrous once you've faced the reality of how rare it is for such violence to occur.
And then when you look at the violence which does occur, and try to understand it, what makes those situations so different, you quickly notice that essentially all occur in situations of desperation. You might be led to suspect that perhaps the desperation is more the problem rather than the persons involved. Perhaps the 'bad people' who didn't kill anybody the day before or the day after aren't simply murder machines who will always be a threat.
This all, however, requires a great deal of thinking. And thinking about emotionally arousing topics at that. Life, death, the uncertainty of strangers, the fragility of ones own situation, etc. Before you can begin down the road of thinking about these things, you have to know how to think. And you have to be willing to think. Both of those factors are in substantially short supply in modern society. The knowing how to think because we don't teach it in schools (the Republican Party in Texas actually had opposition to the teaching of critical thinking skills as a primary plank in their official party platform not long ago) save in college philosophy courses. The willingness due to a total reliance upon intuition as a guide to truth. Intuition can not deal with these topics at all. It arises from the 'default behavior' of our brains which arises from their structure that evolved to keep us alive (just) in small tribes on the African savannah. It is prone to obsession with fear, and fearing the unknown, and fleeing from threats rather than facing or dealing with them. Until a person can turn their back on intuition and use reason instead, the monstrous 'bad people' will be a constant bugaboo.