In nature predators know to avoid anything that’s marked as poisonous in order to avoid ingesting something that will kill them. These creatures usually evolve these markings to avoid being eaten, so it’s mutually beneficial.

It’s kinda like that… You don’t go near these guys because you don’t want anything this guy is selling, and they in turn have anyone who will ask them to have a single fucking thought in their god damn heads turn the other way. You wouldn’t want this guy to think would ya? Think of the headache that’d cause his poor atrophied brain…