"[...] how [IE6] is making the web a terrible place".
I can't really understand you. You're saying IE6 isn't terrible despite it adding so much to project development and costs - it's not so bad now all the bugs are categorised and things like IE7.js (javascript DOM manipulator to fix lots of IE bugs) are available. But back in the day IE6 prevented us from using the latest techniques available in the other major browsers and caused me (and I'm sure thousands of others) many hours of trouble.
I'm using links2 here - we're not talking about not serving someone, we're talking about ditching IE6 as part of the category A line; if they get the majority of info then that's fine don't worry about visuals being exactly right, etc..
Microsoft was evil with IE6 (couldn't they have just told us about hasLayout from the start), they've been forced by the likes of Mozilla to get with the program and now IE8 is quite a good browser with some innovation too (but they should have done PNG like everyone else, what is it 12 years they've failed to get PNG right - a browser that can't even display an image properly after 12 years of dev from the biggest software company in the world ... I mean come on guys, I digress).