In addition to generally messing up online play for me and shifting my hl files, I did some research and found that steam is to blame for other things too.
Steam is to blame for:
Apartheid
Impotence
Cancer
War
Celine Dion
International Terrorism
The War on Terror
The Industrial Era
The 21st Century not being as good as we were led to believe (I'm STILL waiting for my hover bike and giant robots)
pop-rock/nu metal
the crucifixion of Our Lord
Original sin
And is its next update will cause The Apocolypse
Have I missed any?