Every handyman job does not put your life at risk. And as far as brakes go, I once spent a large sum of money on brakes at a big box store. Every three months they wanted to "turn my rotors" (the new ones they put on), but I knew that after three times, I need new rotors again. So, I got rid of their crappy brakes, put some on myself and the car did much better.As long as it is you and yours that are being put at risk, I agree. But one obvious example, car brakes, a bad job endangers everyone on the road. And depending where you live, a house fire will at least endanger the firefighters and possibly spread to other houses so crappy electrical or gas work also endangers others.
Isn't there something along the lines that your freedom to swing your arms around stops at my nose?
Having access to alcohol puts people at risk, but we still allow people to buy it and society assumes some risk for the Liberty of having access to alcohol. How much control do you want?