Back when I started hitch-hiking, I read something from a veteran to the effect that if I didn't feel I could handle any situation which might arise I had best stay home.
Makes sense to me. Even if I brought ten guns and three knives, I might not have them handy ... and as many situations will involve law enforcement as will involve any other sorts of people ... a calm heart, a clear mind, and quick wits can get you out of almost anything.
Not saying there is anything wrong with carrying, or carrying on a tour. Just, to me, it would not be necessary in any situation in which I could reasonably imagine myself.