You mentioning 'psychological issues' reminded me of the (super interesting) book Thinking, Fast and Slow by Daniel Kahneman. In that book there is something about our ability to asses risk and emotionally perceive danger that is biased by dangers that typically occurred during many thousand years of human evolution - physical violence is evolutionary very old and that's why we react to it strongly. On the other side there are things that might be more dangerous (like obesity which kills way more people than terrorism) but evolutionary these are relatively new and we have yet to develop the 'sense of danger' to them. [I am just paraphrasing that book - any mistakes made here are mine and Daniel Kahneman is totally innocent in this.]