I can't remember walking past a weighing room and not seeing a guard/steward so unless their shift finishes as they past the post in the last I'm surprised how easily they were able to enter the weighing room, I fully expect this to lead to a full review of jockey security with immediate improvements.
Sadly people will always have one too many when racing, I do, but there are scum in every walk of life and those who are unable to control the emotions attached to losing a few quid are better off staying at home and upsetting no-one but themselves, racing doesn't need them....