I slice myself all the time, when I was a kid I had a rusty nail go through my foot and nothing happened. But at work they do that because it only takes one time to get tetanus and it's a sort of liability thing. If you get tetanus they will get in major trouble, not to mention having to pay a lot more than a tetanus shot. Also if you get tetanus doing something else, you can't blame it on the workplace since they're like "we gave him shots".