I disagree, it's the US President, not just a "random citizen", random citizens abuse the system all the time, literally all the time and they do illegal things as well, I won't say everyone but realistically large majority of people do illegal things or try to shortcut, cheat, buy illegal drugs, import illegal materials and so-on. Celebrities do it all the time as well, but also the average daddy. Also corruption for our own families happen all the time (preferential treatment) for various reasons, including covering up criminal activities.

I think also many other people than the president should have preferential treatment when it comes to certain things. If it's about health, yes, the president should be able to cut the "line". If it's about renewing a driver license or other petty things, of course as well, that should be straight cutting line, you wouldn't expect a president to waste his time standing in line anywhere.

I'm not from the US but to me it seems just normal to not compare a rando with the president, especially if it doesn't hurt anyone else.

Imagine if we had an experimental drug that would genuinely make people "smarter", why wouldn't you want the president to immediately access it, it can benefit the nation.