why would you feel sorry for the actors???
Maybe they mean voice actors,
There's a lot of screaming and shit here and if i remember correctly the voice actor for bakugou (just an example) suffered a bit with his need to raise his voice all the time.
So if it is about the voice actors yeahhh I'd feel sorry for them too.
There's also that factor but the expressions in general are overly exaggerated in the manga so they ever play a role, they must be pretty expressive when it comes to acting these characters.
If this manga ever has a live action adaptation, I would genuinely feel sorry for the actors. Although it's unlikely for that to happen but just a thought.