Personally I think all the red cards so far in the tournament have been justifiable*, except Balogun's - the Mexican one in the first game was the harshest.....but it was still a purposeful professional foul.....just one where there was probably a covering defender, so it probably should have been yellow.
The Sithole, Muharemovic, Ahmed, Ngoy and Sulaka reds were all no-doubt, last man denying a goal scoring opportunity challenges. The Canobbio red was a last minute "I'm going to ****ing maim someone on the way out" horror challenge (and it wouldn't really matter if you lifted the suspension for that one). The Almiron and Hincapie reds were for covering their mouths while abusing someone (maybe a silly rule, but it is a rule). And Zwane slapped a dude.
Meanwhile, Balogun's contact was purely accidental - he wasn't even looking at the guy he landed on awkwardly.
(*I can't really comment on the second Qatar one, as they never showed a replay in the feed I was watching because the Canadian dude's leg break was so hideous)
Any time a player is unjustifiably sent off for the rest of the tournament, then yes - there is now precedent for them to not serve a suspension.
Doesn't apply to Quansah, sadly. He was just a numpty.