Well, hopefully this will help prevent Bitcoin's biggest use case, which is criminal finance and money laundering. Why wouldn’t we want that?

For very similar reasons why the US has the 5th amendment, why blanket surveillance is not considered a good thing by functioning democracies, and why most people want their porn-viewing habits to remain private.

There are plenty of bad things that need to be prevented, but a functioning democracy requires the ability to act outside the surveillance of both your peers, and the currently sitting government.

What sources do you have that support that claim?