Some of the other games that state lotteries are adopting are almost as bad as sports betting in terms of their availability (look up instant-play gaming), but sports betting feels like a game of skill, which certainly makes it worse from a psychological perspective. I still think it should be legal if people are going to do it anyway. Maybe banning the "specials" on combo bets or requiring them to be labeled as "this is still a bad bet" could help.
For the record, I have a vested interest in sports gambling being banned because I sell products involved in instant-play and other forms of gaming that are not involved in sports betting.