Words matter and unless you take away human emotions, the way we are built we could never have a society where we can say anything to anyone and still function. Words start wars, get people killed all the time. Words matter
The thing is, I don't really care if words start wars or get people killed. At some point in life, you need to make the choice, whether you want a free world or a safe world. You cannot have both.
Ultimately, I believe, once we break the construct that has made people overly emotionally attached to words, and create an environment where speech is truly free, I believe that less wars and less people will get killed over words, than in a very tight, controlled environment where an extensive amount of power to words is given by the state, enough to even imprison people, creating "taboos" that people "must not say" under any circumstances.
Once you give words that kind of power, in a society, then yes, wars will be started by them, people will get killed over them. You turn words into "spells", magic words which have a psychological and physical impact on other people. The N-words, the R-words, the SJW-words, all cause a "triggering" impact on the recipient nowadays, whereas in a free society where people treat themselves as individuals instead of parts of a "greater collective" (based on skin color, religion, political or social ideology or whatever), people would not give those words any power over themselves.
Words would be treated based on their merit, without giving some 50-year old, mentally unstable Nazi apologist the power to hurt other people with childish insults. By sentencing him to prison, you're actually giving his words far more credibility than they deserve. Where I live, people like this would be called the "village idiot" and people would mostly feel pity for him, not anger.