@glitterbag,
It appears to me that many just want a black and white world - they don't function well with greys - have a look at Oralloys comments on 'reality', or his avoidance of the nature of his 'facts'. Trump offers them black & white.
Further (perhaps not realated to Oralloy - this is a general comment), Trump appeals to the bully factor (power over others factor), and the 'I can do what I like' factor that many people, who have little control in their own lives, desperately want in their lives.
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In terms of a less black & white world - It could be argued there are two types of facts (I'm making their titles up):
Irrevocable facts: Facts that are true, no matter the time nor place (again, mathematics are one of the few types of such facts)
Transient facts: Facts that hold true in a time and place, but not in all times or places. These are largely facts based on common acceptance of concepts, or stating the existence of non permanent things (eg 'There is a line on this road'), etc
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All of oralloys 'facts' then, fall under the banner of transient facts. But as he can't comprehend this (the nature of such 'facts'), he can't comprehend why people keep disagreeing while he chants 'I'm stating facts'