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.
Is there really that much betting going on in the "little leagues"?
Professional sports are already and have always been ruined as they, by their very nature of existence, have to appeal to what entertains the crowd, not for what is ideal for the sake of sporting. Betting doesn't really change the calculus there; at most changing what makes for the entertainment, but then you're just going into a silly "my entertainment is better than your entertainment".
Either way, I know little about sports so maybe you’re right regarding American sports. But no way is footie rigged. I just don’t accept it; too many people care too much.