People may disagree, but I find theres normally two types of drug dealers:
1) The stereotypical gangster
2) The preppy, wealthy kid who spends their parents money on a large amount of drugs then sell it in smaller amounts to profit
The second group is mostly marijuana, probably some other things like molly.
But thats probably based on the environment they are in. Drug dealers are risk takers. The preppy kid is someone nobody thinks of as a hardened criminal because he sells pot and goes to private school. In Jerome's case, he sold crack because thats what was in demand in his area. He sold crack and played football.
It doesn't make him inherently a worse person IMO. It just means he's the personality type to take a risk and sell drugs. It just so happens in his environment the drug of choice was crack, so society at large brands him a "thug" when a drug dealer in a nicer area would be seen as someone who needs guidance.
Regardless, I could see it looking good and bad for Notre Dame. Bad because people will say "see!! Notre Dame takes thugs!!!" And others will say "Wow ND turned this kid around"