A lot of scams are in Bitcoin
Scams are not in Bitcoin, it is actually more secure than a whole other number of assets which are open to massive printing and forgery. The scam narrative is spread by anti Bitcoin media to discourage people from using it.
This also raises a question that whether robberies will cease to exist as bitcoin has already surpassed gold.
How has Bitcoin surpassed gold?
Also, you would need to give more information on this, I see no relationship between the rate of robberies and Bitcoin adoption