1) The separation between Stein and Clinton on the issues is actually quite narrow as Stein herself admitted:
So, if you care about the policies that affect Americans, then perhaps one should vote for the person who is likely to win rather than waste a vote. There is a time for purity, and there is a time for doing what is best for the county.Just took the @iSideWith quiz. Unsurprisingly I was a 99% match w/ @BernieSanders. Let's keep the revolution going. pic.twitter.com/ID1HfhEeqp— Dr. Jill Stein (@DrJillStein) June 13, 2016
2) The other 91%? Not great, Bob. Banning of GMO's? Replace NAFTA? Free tuition? Cut defense spending by 50%? "Restore the National Guard as the centerpiece of our defense" hee, hee.
3) Voting for Stein and not for HRC helps Trump. Trump has promised to be almost everything that Stein stands against--a homophobic VP, destructive to the economy, nasty policies for immigrants and on and on. There is a reason why African-Americans and Latinos are voting en masse for HRC and very few for Trump.
I could say that voting for Stein is a great example of white privilege, but that would be unkind. Trump, to put it as bluntly as I can, is essentially an existential threat to democracy, peace and prosperity. So, voting for Stein might feel good, but is pretty much one of the worst things a progressive or left wing person can do this fall.