Saudi Arabia punishes rape victims. We should help with that?
China punishes people who try to air grievances about government abuse and corruption. Again, we should enable them to be more effective in their invasive prying into those individuals than they already are?
In North Korea, your entire family can be punished if you dare be disobedient to the government.
In the US, we recently elected Donald Trump.
Etc. etc... why do you think governments can be trusted with this power?
On top of all that, once the technical means exist, they will also be discovered, cracked, and used by fraudsters, extortionists, and anyone else who can figure out a way to abuse the information.