You are all mislead, this has nothing at all to do with the Presidents demise, it has everything to do with the fools that will actual put money on it!!
The bookies couldn't give a toss whether they are right or wrong, they just care about - MAKING MONEY, IT'S ALWAYS ALWAYS ABOUT THE MONEY !!
If you are really offended about the bet, then don't bet on it - simple as that - then there will be no bet and it will go away.
Get a life people and if you are going to complain about anything, you might want to run it through spellcheck first.
Betting on the Presidents assassination