As we know it's not fair to heckle other people's pastimes unless maybe they verge into doing harm to others/things, but since we're heading into philosophical life/death territory, major-A-road TT riding strikes me as purgatory. They've crossed the Styx and suffering before they've been called. Probably getting my mythology mixed up.
Oh, I've broken my no-heckling rule

Go for broke then - mate of mine fancied trying it so turned up to meet a group in a nearby town. Wasn't really acknowledged or welcomed. Managed somehow to keep up with the phalanx or whatever it is until the half way point where they stopped very briefly. Hardly a word spoken so far. Mate pleased that finally they might all have a nice chat and a larf in a cafe or something so enquired about it. Withering looks, all turned and rode back down same major road and went straight home. He never went again. His main comment, as I've touched on before and others mentioned, was the lack of roadcraft. I agree entirely with Dave that cyclists have every right to ride any road and an expectation of driver consideration, but these guys did little communication/interaction/negotiation with their fellow road users and therein lay the main (self inflicted) danger. I'm probably generalising and there's any number of great TT groups but that was my mate's experience and I've seen the same.
Much rather be out with BPers who are a lovely bunch without exception

. Bizarrely have often seen better roadcraft from MTBers too.
So, back to the Vikings, I can only assume TTers might like dicing with death because they're keen to meet those Valkyries. Hmmm... >thinks<... blimey.. they've got a point... where do I sign up?!