The slig have a phenomenon known as brain worms. A brain worm is an extension of the the sligs brain that breaks off and usually implants itself on another creature. That creature will then share the same ideas and beliefs as the slig. If a slig wants to persuade a community to believe in something it just needs to infect a large enough crowd. If for example there was an open air festival and the slig wanted to implant an idea that fracking for gas was an excellent idea, it would think it, let the worms drop and before long everyone at the festival would think the same too. Most politicians on Freckills have one or two sligs as ‘pets’. No surprise there!