Why do people who thoroughly research evolution believe that it's a fact?

Because it is a fact. Evolution has been observed to occur in modern species; viruses and bacteria evolve so quickly that new vaccines must be prduced each year, for example. Evolution has occurred in the past, as evidenced by various fossil records and genetic, anatomic and physiological comparisons.

Evolution has been used to make predictions, which were entirely accurate. If evolution were not a fact, then these all being so would create a contradiction.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.