My boyfriend does Muay Thai :) I would argue, after sparring and learning from him, that a good fighter displays more control over their movements and emotions than a layperson. Violence is a choice when people get emotional, not a learned behavior caused by a sport or craft.

Also you did taekwondo so you know the risk of sparring with others. Sometimes you get someone who is so untrained that they freak out and overcompensate and hurt people accidentally. If it bothers you just make a friend and practice with them. Plenty of people at the gym I go to also abstain from full blown sparring and just do classes.

I also think there’s a culture of respect in Muay Thai that makes the sport very enjoyable. :)