How do you know Trump intentionally did not serve?
Have you seen his medical records?
Do you think every person who has gotten a deferment did so to
intentionally not serve?
That’s what a deferment was mostly set up for, with a few exceptions. At the time the percentage of people going to college was small compared to today and those were mostly the children of upper class and connected families. Middle class families were just starting to send their children in noticeable amounts. The deferments were set up so the children of upper class and well connected families could stay out of harms way and hope that the war ended before they got out. When they got out of college and the war hadn’t ended a lot of them just had family doctors write up reports of a medical condition(s).
That’s the way it was. Hopefully, it will never be that way again.