Overall, I knew it was a matter of time before Trump gets the virus since he is very exposed. Trump himself has said that people over 65 or so and those with underlying issues should stay at home, so I'm sure he knew he was taking a risk. I think generally people who have underlying conditions or are elderly recognize that the virus can be lethal, however I think healthy people believe they are invincible (people who attend rallies, BLM protestors, etc.) since what they will experience most likely are flu-like symptoms or they might be asymptomatic. So, with Trump, my view is that he knew what he was getting into, that given his age and weight he probably knew he would likely experience more moderate/severe symptoms but that was a risk he was willing to take.