Nobody can come in my house without a judicial warrant. And, hopefully, someday there are better privacy laws in the US that mean that Microsoft must handle its collected data more responsibly.
If your society has succumbed to serious oppression, does evidence really matter anyway? If the cartel is knocking on your door, do they need evidence to do what they want to do?
Evidence itself is just evidence. It can condemn you and it can exonerate you. If it can be proved that something came from my printer, that means my lawyer can also prove something didn't come from my printer.
I am by no means saying that I would personally willingly sign up for telemetry, or that I think it's better to have than not. I'm just not in alarm over it because I think that response is disproportional.