My opinion is they probably care too much about the person and not the issues.
In general, we are all stupid apes in this way and need to come correct. I dare you to show me someone with Bernie and Trump as their top two on isidewith.
For the vast majority of Bernie voters, Hillary is much closer to their stance on the issues than certainly ANY Republican candidate.
You can protest vote against Hillary if you want, but if you protest vote for the Republican, you are very likely a moron ( with very rare exceptions for genuinely bizarre personal political ideologies)