I take a Democrat candidate seriously for the same reason that I pay attention to the any individual or group of menacing strangers when I make a pizza delivery in a bad neighborhood. It is the reasonable expectation that they may harm me.
Over the last three decades that I have observed the Democrats I have noticed that not only do they persistently take a wrong position on an issue, they will often do so as a simple mindless negation of the Republican position.
Violent Crime: Don't accept as a fact of reality that it is an act of will on the part of the criminal. Don't apprehend, prosecute, imprison, or where warranted execute the criminal. Instead attack innocent people, disarm them, and leave them helpless in the face of a growing population of violent criminals.
That's just one example. I could go on about insanity of their positions on National Defense, Energy Policy, Taxation, etc. But I really don't have time to do so. (Unlike some folks on the Left I have to go to work.)
The Democrats are not just a party that has to be opposed on individual issues. They are demonstrating that (they) are following a mental methodology that consistently places them in opposition to reality. And reality is real, opposing it will hurt you.
We now return you to your regularly scheduled reality.