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they vandalize public roads with spray paint arrows and symbols to show their friends which way to go

Sounds like there was an organized cycling event.
I'm a bicyclist and would never ride more than a 3 person pack on a well travelled road that is shared with cars because the cars need to be able to get around us. I don't expect a car to travel 15mph just because they can't get around 5 cyclists that are spread out. As a matter of fact, most places it is illegal to ride in packs for that very reason and you aren't even supposed to be side-by-side. Courtesy goes both ways and cyclists and motorists need to work together. Nobody owns the road. >

And yet we’ve all seen packs of Bicycles clogging up the road. 
Quite frankly I don’t think it’s a good idea for 5,000lb SUVs going 55mph and 175lb cyclists going 15mph to be sharing any kind of road.