....
The Nazi party campaigned on socialist ideas (and lost), and labeled themselves socialists, but as soon as they assumed power Hitler immediately had the senior officials of every opposition political party murdered along with their families and other supporters.
Then he invaded a bunch of countries and forced every man to either fight for him or have their family murdered.
He murdered almost 10 million people just because they were Jewish, gay, disabled or suspected of criticizing the Nazi party.
Using the Nazi party as an example of why someone shouldn't vote for Bernie is pretty silly unless you believe Bernie has some secret agenda to become a dictator.
But isn't that the very point that people continue to warn about, as a fundamental flaw in the theory of socialism?
"as soon as they assumed power "
... they can do anything they want...
So why, exactly, should you believe Bernie on anything?
He's been pushing the same healthcare, healthcare, immigration and labor policies while also defending the idea of democracy and the freedoms that come with it for 40 years. I'm convinced that he really does believe that his policies would do more good than anything anyone else has proposed. (Note: Personally, I'm not convinced that his policies are the answer right now)
There are tons of valid reasons to be anti-Bernie, but, in my opinion, being worried that he will try to become a dictator, take over the world, execute all who oppose him, or commit genocide are not among them.