Because before the Won was inaugurated, there were never any leftists protests that compared Bush to Hitler or called for the death of the President. This is all a racist teabagger thing that started around noon on 20 January 2009... The last 30 seconds or so are the most enlightening of how peaceful the Left can be.
[youtube=425,350]http://www.youtube.com/watch?v=z6b1VOAATNk[/youtube]
Edited to fix grammar.