Are dirt bikes dangerous?

I bought a 70cc pit bike off Craigslist cheap and brought it home. My parents first reaction was just shitting on my face. They said its a waste of money, dangerous, and stupid. My question is how are they so dangerous compared to other things? We have always had 4 wheelers growing up that we beat the bag out of,... show more I bought a 70cc pit bike off Craigslist cheap and brought it home. My parents first reaction was just shitting on my face. They said its a waste of money, dangerous, and stupid. My question is how are they so dangerous compared to other things? We have always had 4 wheelers growing up that we beat the bag out of, but that's ok I guess. They are "what if" people. I feel going through life looking at every little "what if" you might as well not live at all.
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