I agree that the label "violence" is manipulative. Using the label "harm" instead would be more accurate.
"Excessively" loud noise in residential areas is banned for a bunch of reasons, none of which have anything to do with hormones:
1. It's annoying and disruptive to the residents of the area. No hormones required;
2. It's often selectively applied to harass members of less-favored groups, to make them uncomfortable living in that area with the hope that they'll move out.
2. It's banned regardless of who it is targeting.
You're retconning[0] here.
Many (most?) noise regulations were implemented before anyone other than endocrinologists and a few neuroscientists (and many before even that) knew that cortisol even existed.
No.
The only good argument is that speech shouldn't be banned even if it leads to a large stress response, because of the slippery slope risk and so on.
Taking the position that either (i) speech can't generate a large stress response that's physically harmful to the individual, or that (ii) our knowledge of how stress is generated somehow changes whether or not stressors should be banned -- these are both not good arguments.
No.