Mr Author you can still inject "social issues" into your work!
Just don't expect the heavy hand of Editor-san not to sink you into the ground like that merchant if you do though, there's always a price for everything!
Frankly speaking, I don't want social issues in manga, at least real life ones. Fantasy politics and social issues can be fun, but when it's made to make a point about real life, I personally don't welcome it.