But a much easier argument against sports betting is that it ruins the sports. Players throw. They get good at subtly cheating. The gambling apparatus latches itself to the sport, to the teams and players, the umpires and judges, the sporting organizations. With this much money on the line, it's not a matter of if but when games are thrown, cheated -- the bigger the game, the bigger the incentive. It's even easier now because of the amount of side/parlay betting that is available. It exhausts the spirit of competition.
Sports gambling is diametrically opposed to sport itself.
A shooting range I used to go to would not rent to unaccompanied men. They had to be members and take a class at least, or be in a group, or bring their own guns. This was to prevent impulsive suicides. Maybe if you want to keep any kind of gambling on sports, you should have to go to a sports book with your pals and watch some games together.
Putting the casino in your pocket feels like a social suicide.