We can't let these hypothetical worst-case scenarios be an excuse to stifle innovation.
What happens if we let people modify their microwaves and a terrorist uses his to give kids cancer!?!?
What if we let people tinker with their toasters and somebody uses one to electrocute a pool full of kids!?!?
Please, think of the children!
I know this was said in jest, but given the (generally unfounded) fears some people have about microwaves and cellphones I want to point out that exposure to unshielded microwave radiation isn't going to cause cancer (at least not any more than anything else that heats you up could somehow cause cancer) because microwave radiation is non-ionizing; you would need at least ultraviolet light for that (and UV-C or X-rays would be most effective).
The biggest danger with strong microwave radiation would be boiling your eyeballs as they lack the cooling most of your body has but contain significant amounts of water.
Sauna heat does not preferentially target liquid for heating.
By the time you have to worry about specific non-brain parts being overheated, your overall temperature is such that you're braindead.
Pretend my original comment ended with "Past that, you basically fell in a fire and it doesn't matter what is heating you." Is there anything wrong with that? Or the rejection of the idea that bone marrow is at risk?
Well, given that the Earth could be wiped out at any moment with the nuclear weapons and stuff we stockpiled, long term this idea might prove to be laughably wrong.
Yes, we sure can.
I don't want your "innovation" killing a bunch of people.
If you can't innovate without endangering people, you need to "innovate your innovation" and come up with a way you can do it safely.