For people who couldn't see the problem in the first video, the problem was just that MQ speaks rather rudely or ill-mannered towards other people and people were bothered by that and also that it made Chanyeol look bad for working with him. Then they released the step-dance video as an apology but many people didn't think it was adequate enough for a few reasons. One, they never explicitly apologize. I understand how there's a deeper meaning to the video with unity and stuff like that but it could come off as insincere and the meaning can be lost for most people. Second, it was an issue solely with how MQ spoke to other people but they made the entire staff apologize. Third, because it was an issue with how MQ spoke in Korean to other Korean people, knetz are upset because the "apology" seemed to be directed at English-speaking viewers.

Maybe they meant a show of unity, I'm sure many of them know how the person is and still decided to work with him. He could lack social skills but because of his other merits it matters less to them. Some people have good hearts even if they appear otherwise. And you don't know what goes on behind the scene.