But you're not Chef, you're just a guy making a routine breakfast or lunch. As time goes by you get used to the routine. It's just an omelette or sandwich, you'll never think of each particular one once it's consumed. If there's a hole in an omelette, or the bread in the sandwich is skewed, you won't even remember it later in the day. It's just a thing you do every day, and despite any earlier desire to be the best omelette or sandwich maker, the only really important thing is that you've eaten.
Those cops do that job every day, and the only important thing to them is that they've taken someone off the bus and searched them, and they can then report that. Discovery of contraband is just a bonus.
The do it every day, and unless they find something they will never see "you" ever again. In fact they don't even see "you" during the event. You're just a resource so that they can make a report.
You're just a resource.
Would it ever occur to you to apologize to your sandwich for being less than perfect?
Would it ever occur to those police to notice the individual, in a routine played out every day, and apologise or even acknowledge?
You're just a resource.
So no, it's not excuse, never was, never will be.
The difference between civilian occupations and law enforcement is that cops look for bad. They see everyone with suspicion. It's a conflict, where the occupations you list all participants have essentially the same goal. An interaction as described with cops is not voluntary and both sides have different motivations: to get away as quickly and non-disruptively as possible, vs trying to find evidence of any crime you might have committed.
Most people aren't criminals so police should be polite by default. They should be providing an example first, looking for criminals second. Unless they're on the chase of a known criminal, of course. Unfortunately, these days it is not enforced by anything, so we should take steps to restore those affairs.
Police officers have a monopoly in their industry. If you're being detained, you can't choose to take your business to another police jurisdiction. You're stuck with them no matter how rude they decide to be.
There are always A-holes around in the police but consistently getting the frisky treatment would make me wonder if something in my appearance could be seen as cop-bait. Maybe the dreads and the weed silhouette on your cap? Just kidding, but since we don't know what you looked like, it's hard to tell if what happened to you was plain bad luck or something in your looks and/or expressed attitude. Definitely not something that happens to everyone.
The cops never found anything, but they succeeded in making me hate their guts for the rest of my life.