The mod isn't the problem.
The user is.
Ahh I thought so.
You are confusing responsibility with "legal liability".
Totally different, though my stance is roughly the same, however legally, the liability can stop with something as simple as "sold as is, use at your own risk".
The thing is, you have to be responsible for your own safety.
If not you will eventually get hurt.
You may not be able to sue afterwards so worrying about who's liable would be moot.
It better to be use common sense and safe than to count on a lawyer.
I'm Not confusing Liability with Responsibility.
I feel that OEM's have a shared Responsibility to make Products that Minimize the Chances of a User Injuring themselves. Just as I feel Sellers do Also. And they Share this Responsibility with Users knowing how to Use their Product.
Saying it is All on the User isn't Viable. And it doesn't make for a Market of Better Product.