Why shouldn't I believe his words?

I understand the perspective, that no one can be as bad as Hitler.  However, when someone says these things, and I have no reason to believe he won't do these things, a comparison is fair and reasonable. Did the German people know in 1933 what the outcome was going to be? Did my grandparents know they were going to need to flee their country 3 years later? Did my great grandparents know they would die in gas chambers? I don't hear any of his supporters denying he said any of this.  Sure, they are doing some serious gaslighting, to make it go away but why shouldn’t I believe what he says?

Honestly, I find him so reprehensible, so vile and disgusting, a convicted rapist conman, who has convinced people that everyone else is lying except for him and Fox News, spewing lies that are easily disproven. He is a traitor who will turn his back on the country if it helps him. He will sell anything to the highest bidder, to improve his own position, but will not lift a finger to help anyone else, especially those in need or those who oppose him. He has no understanding of country and honor; he only cares for himself. He can’t stand the majority of his supporters, but yet they continue to carry a torch for him because they see themselves in his hateful words. Isnt the president supposed to represents all citizens of our country, not just those who vote for him or those who cow-tow to him.

He is doing nothing to appeal to anyone beyond his base who is primarily white and evangelicals who want to turn the United States into a theocracy. He talks about this country being a garbage can, where conservative hero Ronald Reagan talked about America being the shining city on the hill. He wants to throw out all immigrants who come here simply to make a better a life for themselves. He does not care if they are here legally or not, claiming asylum from persecution in their home country or not. Those immigrants are me, those immigrants are my grandparents, and I am going to continue to believe they have every right to be here, to make a better life for their children because they see the city on the hill, and they want to put their children in a place to succeed for generations to come. These immigrants are not taking our jobs, they are working the one’s that no one else wants.   They work 2-3 jobs, often 7 days a week, with no benefits, unable to collect social security. They are the underbelly of our economic engine that powers our farms, our restaurants, our landscapers, and every other back breaking job that I certainly would not want to do myself. 

"I've spoken of the shining city all my political life, but I don't know if I ever quite communicated what I saw when I said it. But in my mind it was a tall, proud city built on rocks stronger than oceans, wind-swept, God-blessed, and teeming with people of all kinds living in harmony and peace; a city with free ports that hummed with commerce and creativity. And if there had to be city walls, the walls had doors and the doors were open to anyone with the will and the heart to get here. That's how I saw it, and see it still." - Ronald Reagan Farewell Address January 11, 1989