Easy fix. Open carry and trade in a public place with lots of cameras. Criminals are stupid but they aren't that stupid.
Since NY citizens don't have the same rights as normal people (and can't carry the tools required to protect themselves), I suggest they trade in the police station lobby.

The gif is funny

Anyways it's quite easy to avoid these circumstances , just deal in a public place and don't carry much in single wallet
But if you're out of luck , you will get robbed anyway

By the looks of it that guy had his femoral artery or vein slashed and is bleeding out all over his leg and the ground. I wouldn't consider that funny at all. I honestly hope the guy lived...
Femoral artery?!!! Geez way to take a gif WAAYYYYY out of context, dude!

The guy is clearing pissing himself, touching his wallet with pee, and touching the dollars in the wallet with pee, thus disgusting the robber in the process.
I agree, he wouldn't stay upright bleeding that fast.