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dis·sent
dəˈsent/
verb
1.
hold or express opinions that are at variance with those previously, commonly, or officially expressed.
"two members dissented from the majority"
noun
1.
the expression or holding of opinions at variance with those previously, commonly, or officially held.
"there was no dissent from this view"
synonyms: disagreement, difference of opinion, argument, dispute; More
vi·o·lent
ˈvī(ə)lənt/Submit
adjective
using or involving physical force intended to hurt, damage, or kill someone or something.
"a violent confrontation with riot police"
synonyms: brutal, vicious, savage, rough, aggressive, abusive, physically abusive, threatening, fierce, physical, wild, ferocious; More
(especially of an emotion or unpleasant or destructive natural force) very strong or powerful.
"violent dislike"
synonyms: intense, extreme, strong, powerful, vehement, intemperate, unbridled, uncontrollable, ungovernable, inordinate, consuming, passionate
"violent jealousy"
(of a color) vivid.

As you can see, dissent and violent are not the same thing. The more you know!