How to accidentally electrocute yourself and start a house fire
Safety is certainly a consideration when contemplating projects like this one but it is by no means the only one and often not even the most important one. Safetyism is what you get when you make it the most important consideration, it is not a recipe for a healthy society.
BTW, if you really want to electrocute yourself that puny little battery won't do the trick, for that you need a a bit more voltage. Never fear, that is easily achieved by taking a few of those plastic snow poles used to mark out roads in colder places and filling them with 18650 cells. A 2 metre pole is good for 30 cells which give you about 130 Volts of DC fully charged. Those cells are capable of pushing quite a bit of current so if you're really into dangerous games that'd be an example of one.
Survivor bias. Look at average life expectancy up until the 1950s... it was shockingly low. Most people had many MANY many children just to see one or two live to adulthood - accidents and pandemics claimed their lives, workplace injuries and wars took them as adults. Your great-grandfather likely had four to five siblings [1], earlier generations were at around seven in the US [2].
It's only because of vaccines, OSHA, antibiotics and medicine that human life expectancy has exploded over the last decades. House fires are among the most stubborn killers that still remain, the numbers are going down extremely slowly [3].
[1] https://ourworldindata.org/global-fertility-has-halved
[2] https://populationeducation.org/wp-content/uploads/2020/04/a...
It's not learn-as-you-go like computers. A mistake doesn't give compiler errors. It might just kill you now, or get red hot later under certain conditions you haven't tested.
If you can't see that this gongshow is obviously dangerous then you are a fool.