They eat their own.
The NeverHillary crowd are similar to the NeverTrump crowd. Voting for third party or staying home is helping Trump/Hillary.
Look at the hit piece CNN is running on Johnson this morning. They know Hillary votes are going to him and are trying to stop the bleeding. Problem is: Bernie fans saw the DNC emails and know Hitlery gave DWS a job right after she left the DNC. The fix was in. Voting third party punishes Hillary.