People can get hurt or killed. People may be breaking the law by engaging in violence. People can make their point without resorting to violence. Violence can often undermine a protest as the protesters will be accused of being bad people and so their protest is not valid. It gives those they are protesting against something to use against the protesters. So for these and other reasons there should not be violence at protests.
non violence...
In some sports it is not only acceptable it is required.
He did abandon non-violent protest as it was not working out
No.
with your soul not with physical violence
Gandhi is famous for leading peaceful protest. he never used violence against violence
A peaceful protest is simply a demonstration of a belief without violence. Picketing is one of the most common, as is a petition.
Violence is mainly unacceptable unless there is a special case like when someone is violent to you.
riot
malcolm x
Violence may be considered acceptable in self-defense or in defense of others when there is an immediate threat of harm that cannot be resolved through non-violent means.
Basque separatists