Those are some poor comparisons to guns honestly. With all of those examples, simply screwing up building them can be deadly-if someone screws up making a gun, it won't fire, or worst case might blow up in your hand if you shoot it or misifre. Someone mess up setting a gas line, could cause an explosion. Mess up electric device could electrocute someone or start a fire. Mess up a aircraft or vehicle can cause a crash. So a lot of the regulations involved in those issues revolve around building them safely, making sure they work properly, that no issues might pop up. So of course tons of regulations get added. How many of those regulations however are in regard to limiting who can purchase or access these things?
I do agree that simply saying "guy was just nuts" isn't helpful to mass shootings. There were bound to be multiple factors involved. Best thing we can do is try identify, then try to remove and limit factors that lead people to shootings. Off the top of my head some factors would be bullying, depression, and abuse. Course we can't identify and remove every factor, but we should at least try to do so and limit whatever we can't remove.