Bugs corrode too, did ya know that? Seriously...acids and super high PH in their guts. Come to think of it, UV rays play hell on paint, they brittle your plastics, fade shit, break down your gear, etc. Heck, let's not even get into all the shit that rain can do...short out electrical components, acid-rain heavy metals can wear on a bike. Gasoline vapors? Same....really bad for paints, plastics, etc. Jesus we had better re-think taking these things out.