I doubt it. The vast majority of people are afraid of confrontation; but that's also seldom why people say or do anything when they should. Those who do talk tough are only capable of that. Those who threaten violence are almost never willing especially with other people around. I wouldn't expect someone to enforce this either but it can't hurt to call them out in front of everyone else 'HEY EVERYONE, LOOK AT MR.SELFISH HERE WITH HIS FOUR JERRY CANS.' What're they going to do about it? Jack $&!#. At least you may have made them feel somewhat uncomfortable after.