They have the power to confiscate my device for an indeterminate amount of time. They have the power to detain me briefly. I accept those as possible consequences of refusal.
If you're referring to the power to do illegal things, do you apply this everywhere? If a cop asks to enter my home, should I let them because they can illegally shoot me? If a beggar asks for money, should I give it to them because they might become violent?
There is also a huge space between "obeying the laws and policies in the most conservative sense" (which is what you described) and being "illegal".
> do you apply this everywhere
In fact I do.
> should I let them because they can illegally shoot me
I'm not suggesting what you should do. That's up to you. I'm just saying the government can do a lot more than you think and get away with it, including "illegally" shooting you in circumstances. It's always a balance of risks. For me personally, If a normal cop ask to enter I'll refuse. But if it's ICE? That's suddenly a much harder choice.
Actually no I'll probably die either way. Who cares.
Only in theory. Yes you have "rights", but they have power.