If you are a Sanders supporter and Hillary wins the Democratic primary, here is why you should vote for Trump and not Hillary Clinton.
Let's start with the broad strokes. The establishment Neocons and Wall Street wing of the Republican party would rather have Republicans vote for Hillary Clinton than Donald Trump. These are the same people that lead the United States and indeed the world into the last two massive national and global disasters - the Iraq War and the Financial Crisis of 2009. This is one of those clear indications that more than a Democratic establishment or Republican establishment, there is a Washington DC establishment.
These are the same people that absolutely hate Bernie Sanders. At his core, Bernie Sanders stands against the pernicious influence of free trade, related issues of immigration, of corporatist owned DC establishment, of military adventurism. Like Bernie Sanders, Donald Trump is for the expansion of Social Security and Medicaid. In fact, Donald Trump has favored national single payer, much like Bernie Sanders. Donald Trump, like Bernie Sanders, prioritizes the improvement of the national infrastructure - using American labor - over wars like the Iraq War, a war that Hillary Clinton supported and one that has left the Middle East in shambles and much worse shape than when started. The terrorists now run their own country in what used to be Iraq.
Obviously, there are differences, but In pretty much every way that matters, Donald Trump is more similar to Bernie Sanders than Hillary Clinton.
Why shouldn't you vote for Donald Trump? Because he makes figurative speeches about a wall on the Mexican border, wall the he's going to make the Mexicans pay for? No one in his right mind thinks he's talking about the Mexicans pay for an actual, physical two thousand mile wall, one which got a few feet higher after ex Mexican Presidente Vicente Fox weighed in. But people understand that we should make illegal immigration harder. No one actually believes that Muslims will be banned from entering the country. That's just unconstitutional. But you understand the sentiment of making things harder - the Europeans are seeing what happens when you allow not just radical Islam, but large groups of conservative Muslims who don't share Western values to metastasize.