That's cool - you can also love playing Russian Roulette itself - that doesn't mean we have to make it legal for you to actually do that.
If the worst thing a vaccine mandate is doing is preventing you from getting your jollies from being an idiot I see no problem with enforcing a mandate.
Some people love to gamble.
There exist people who are risk averse, risk neutral, or risk loving (in an economic or psychologic sense): https://en.wikipedia.org/wiki/Risk_aversion