I'll give you the short version: they sponsored & supported the most influential AIDS denialist group of the 2000's, resulting in national policies in South Africa that caused an estimated 330,000 deaths there.
Dave's the face of the band and deserves all the flack he's getting for promoting this stuff, but an extra double fuck you to Nate Mendel who brought it to the band in the first place (per this article).
Nate, you suck and your bass parts have always been boring.
This was mentioned in a 2002 Australian comedy music documentary series John Safran's Music Jamboree. Foo Fighters AIDS denialism extract clip below. I don't recall any prominent follow on coverage in Australia after this however. www.youtube.com/watch?v=XCFP...
The longer version starts with Christine Maggiore, who was diagnosed HIV+ in 1992.
In 1994, she encountered Peter Duesberg, UC Berkeley professor of virology who convinced her that HIV is a harmless passenger virus and AIDS is actually caused by party drugs or antiviral treatments.
Imma be honest, I was expecting something bad, but I wasn't ready for the Foo Fighters being partially responsible for over 300k deaths when I opened this thread.