This doesn't really explain why folks want to be cops in other countries - Heck, I live in a country where they haven't traditionally carried guns, though they are starting to nationwide from time to time. They do have them available to them. Not only that, but not all of them will be automatically horrible folks. Some actually do want to simply help folks. Not all of them that apply are the asshole. And some of the problem is our own laws and expectations.

At this point, I should mention that I personally dislike cops, and have had really bad interactions with them, including one blaming another's suicide attempt on me. But I also know it isn't universal.

If you do want to arrest and harm folks, no, you shouldn't be on the force. There are other way to sort out these folks or make the behavior different. Pass actual laws protecting folks from such things. Give cops more education. Have laws that make sense. Hire enough police so that they have more time away from folks that are doing harm. Have cops do more work on things that are socially uplifting - where they have contact with good people - and pay the cops for this. Require they are respectful. Require they take the abuse we expect call center and retail employees to take (like being told to fudge off, yelled at, and generally called names). Require police to live in the areas they are policing. Make sure the laws are fair and that we fairly police different sorts of areas. And so on.