If the user has a special remote that, when pressed in a certain way, is capable of triggering a nuclear bomb, and if the user has no idea what clicking the buttons on that remote does (they are, after all, just trying to change channels), you’re telling me that the user is responsible for detonating that bomb, and not the company who build the remote (and did not provide detailed instructions on how that remote works, or configure the remote to Not detonate a bomb)?

IANAL but it seems to me that:

i) it would not be weird to be tried for manslaughter;

ii) it would not be weird to be found innocent/for the case to be dismissed.

Generally people prefer not to experience (i) even if they can expect (ii).

Usually, any functioning government that wants their country to keep existing would never let normal people anywhere close to such a remote. You wouldn't want your nuclear power plant to be accessible like a music festival either. But governments are slow and people were also allowed to freely buy and own uranium as late as the 1970s.