There is of course some risk with drafting, as with everything, but in general it's safer to draft with traffic than to gutter out of traffic. And way more fun. I sort of think that's the real reason drafting's so frowned upon on this forum - 'cause it's a ton of fun. Going fast is fun, for some people. Maybe there'd be more bike commuters if people realized you can whizz along on a bike and you don't have to sit choking on the side of the road? I'm certainly in favor of segregated lanes so slower riders can be as safe as quicker ones. But this is A&S territory I suppose.
Someone mentioned potholes and reaction times. OK. I usually avoid them. I've never crashed due to them. Maybe someday. But maybe someday in the bike lane on some crud or ice not cleared. Look, I'm not saying anyone should draft if they're not able to or comfortable, but please lay off those of us who do, because it's only dangerous if we make it dangerous. When I look at bike fatality stats, the biggest contributors are driver negligence, no lights, riding the wrong way, riding drunk, etc. I don't see "drafting a car" anywhere.
To those condemning it: have you tried it?