Ah, the old "let's not have gun control, criminals can always find a gun" again. Except that when there are fewer guns around it is manifestly harder for more criminals to find.That's not my argument though. Gambling is not the equivalent of a gun in this situation. Gambling is the catalyst, sure, but the crime is making death threats. Removing all the reasons why people might make death threats in order to stop the death threats is going to be tricky.
If you want an analogy it's like the argument is 'Let's not have banks because they only encourage bank robbers!', and I'm here arguing that really we just need to make bank robbery a crime.