I can't guarantee you that. I can't promise every person you pass on the street won't kill you by stabbing you in the eye with a pencil. I can't promise that no one will throw you into an oncoming bus.
As to fear about planes or fear in general, the foundation of fear, especially such that motivates policy, should be based on odds. I am terrified when I fly. I still fly. I know, deep down, that I have a higher chance of dying by driving. The fear is real in an abstract sense: this could kill me. It is not something that I should put much emotional/physical response in because it is so unlikely as to not be a problem. To put it another way, I should not let my fear of flying affect my personal travel policy.
Every day millions of Americans have guns and don't kill anyone. To try to ban guns because of the few bad actors is like trying to ban all Muslims. Statistically there are about 700k Muslims that lean with ISIS (at least wanting to establish a caliphate). I apply the same heuristic as above to the question, "should I fear Muslims?" My answer is that statically, no. Should I respect the possibility of one of those 700k going nuts glib? Sure. But I don't worry about Muslim co-workers or Muslims walking down the street.