Dangerous jobs can sometimes be difficult to avoid, especially since those with an element of danger do pay better. I live in Wyoming, and the only real decent-paying jobs most people are likely to find are in oil and gas. You might get blown up, set on fire, be dismembered, or have horrific falls -- but the paychecks can actually support your family, even if you only get to see them for one week out of three.
Dangerous hobbies are a completely different issue. Yes, everyone has their hobbies, and many have some element of danger. However, bringing a life into the world has many responsibilities, and always includes sacrifices. That sacrifice may be that that high-death-rate hobby just has to go on hold until the children are older. I had a friend who died while extreme snowboarding, and left a 2-year-old and 1-year-old without a father -- to me, that's about as irresponsible as anyone could ever get. Yes, you could die trying to cross a street, but deliberately flirting with death when you have dependents isn't acceptable.