"Why would anyone in their right mind listen to a Trump speech".

Well one reason would be to be informed, and avoid exposing oneself as a vessel of propaganda.

If you didn't actually listen to the speech, then how can you be so sure of what was in the speech?

It is very telling that somehow you can "recall speech pathologists, psychiatrists and professors of English"  but you avoid listening to the actual content.

In logic this is called an argument from ignorance.   Basically concluding that lack of evidence to the contrary is proof.

Now, there is plenty of evidence to the contrary,  but since you WONT ACTUALLY LOOK AT IT,  you are arguing from a position of voluntary ignorance.