Stick/Badger i do see your old age view point, but the problem is you need something to eliminate that risk of temptation, by your logics its all the individuals fault so why should rape and murder be illegal, as surely it's all because of the individuals so if it's legal or illegal they're still going to commit the crime and the people that wouldn't commit the crime wouldn't whether it was legal or illegal. When that is nonsense, the deterrent to people is the consequences in place.
Limiting these people to how much they can gamble/win or removing them completely eliminates and reduces that temptation the bookies put in place. It makes a lot of good people bad just looking at the stats/information, it leads to more suicides, more robberies, more violence, more harassment and more anger/hatred. The world has enough of that in, why allow ourselves to contribute too it?
If crack and heroin were legal instead of illegal a hell of a lot more people would do it, has nothing to do with the individual making his own choices, if the temptation is on offer some can not resist, people are not wired that way. Drinking, Gambling and Smoking are not allowed in the religion of being a muslim, yet 32% of muslims in this country admit to doing or having done at least one. Purely because they can't resist the temptation. It's a brain and human thing that a lot of people just can't control.