Oh I guess this was party a misunderstanding. I meant that most demos don't lead to any significant change, but sometimes violence hence I said "they only lead to violence. " I did not mean to say that they always lead to violence.
that environment breeds violence
that is pretty much exactly what I mean. I have seen videos of people actually discussing problems controvercially while respecting each other. This was very rare footage though.
Demonstrations often feel like a shouting contest and I would argue that you generally see more demonstrations that are just against something without really offering a thought through alternative.