Of course, and there are circumstances where arguments over a pack of gum have resulted in extreme results.
If we didn't have people who stood up for principles, we would all have a British accents (no offense Klob...). We would still be segregated..etc etc.
Extremists and non-extremists can both stand up for similar principles (MLK / Malcolm X).
For the sake of irony, I will leave with a quote, "A man who stands for nothing, falls for anything" (or something like that...)