On their face, a lot of people would say no, but let's look a little deeper:
Treating legal adults (18-20 year olds) like children.
And far, far worse, the fed blackmailing, yes blackmailing the states. This part is a huge deal. It showcases the fed's willingness to disregard its constitutional charter, and to rule in ways more accustomed to an organized crime racquet. Blackmail deserves and should earn no respect for legitimacy, and I will give it none even if it has happened for a long time, and even if its done for some altruistic reason.
I think you people are over-reacting and getting all mad about something that isn't even a big deal.
I'm not over-reacting or getting angry. I'm merely voicing objection to the law, in a calm rational manner. That's all.