Look at it as a person who makes incredible cheese dip, but they also occasionally pick up lamps and smash them.

Do you invite them to your party?

Sure you do. Just hide the lamps, or dont let them near the lamps. Better yet - give them a lamp you dont give a shit about and lock them in the shed.

This is the democrats with bernie, just like the Republicans with the Paul's. Hard to blame the establishment, because it works - they always show up to the next party with more cheese dip.