This isn't a matter of politics of GPL
Software regardless of the license can be used to thwart human rights, freedom of speech and so on.
But those things are not a matter of politics. Neither they are a matter of Free Software vs. Proprietary Software. They are a matter of ethics. The users decide how they use the software based on their ethical values.
As a (poor) analog I'd like you to consider scissor manufacturers. Should the sales of scissors be restricted? Should a user sign an agreement not to use the scissors to harm another person?
I'm sure you'll too see that scissors, like software, is just a tool and it is up to the users to use in a way which is ethical. There is no license or enforceable contract which would make people behave in an ethical way. If there were, I'm sure it would already exist so that we could have been spared of a dozen or so big wars, many genocides, and other such things.