Because think of it this way. How this person rationalizes it:

• “It’s just me doing this. I get paid, my kids get taken care of, and it’ll only affect the outcome of the election if he loses in a ton of other places. What are the chances of that!?”

Basically a lot of little people not realizing their fraud adds up into a big, history altering picture that will change the course of our country with relation to domestic and foreign policy.