I'll tell you something that happened to me. I was driving for an owner and he told me to hire a co driver. I found a guy and the owner run a background check, and got him approved with the company then I hired him.
He had gone through truck driving school and drove for one of the big truckload companies as a student for about 2 weeks. Theh he went back to his old job. When he got on the truck with me he hadn't been on one in 5 years. He was bad about poping the clutch. I told him repeatedly he was gonna throw the drive shaft doing that. After about a month I got tired of repeating myself. I checked the drive shaft and the yokes were lose. So the drive shaft was just about ready to go. Luckily I got tightened back up.
I talked to the owner about it, and he said if he were me he would fire him. I thought about it, and called the truck driving school he had went to. They would let him go through a refresher course for free. I think it was like a week or 2 week deal. I told him he could go through the refresher course or he had a week to shape up or ship out. He said he quit. I called the owner and he told me to take him to my house so he could get his vehicle.
I hated to see him go, but the owner didn't want to replace a drive shaft and I didn't want the downtime. So we split ways. It's business. Sometimes business descisions like that have to be made. It's nothing personal, but you can't have someone working for you that is going to neglect and/or tear up equipment. In my eyes it's no more personal than telling a dispatcher you can't take a load that will cost you money instead of making you money. Sure they may get their feelings hurt, but they will get over it.
I had a guy let me go once for putting a whole in a metal building with an auger on an auger truck. It was accident, but I got fired. The whole time he was firing me he was complimenting my work ethic. 2 weeks later he called me back. I already had another job that paid better. he told me to put on any application that I got laid off. He's my uncle by marriage. I see him all the time, and I have no hard feelings towards him. He did what he had to do.