The root cause of all abuse is thinking other people are less important than your self, and as such can be treated worse than you.
Antisemitism comes from feeling of oppression (I guess. I really don't understand this one). Child abuse often justified as for their own good. Honour killings come from need to maintain honour. I am quite sure this is not a complete list. Even if the end result you propose would solve everything, how do we get there? Because just believing everyone is just as important as everyone else doesn't solve the abuse I listed above.
So tell me, how does shit-talking on the Internet reduce violence? What particular form of abuse is it efficient at solving?
Profanities won't solve it, nor am I advocating for them. But sometimes people in these sort of debates are so oblivious of the issues, I can understand why every other word a swear word.