Besides the obvious, who defines what is oppressive? If we are censoring people then there should be due process at a minimum, so who writes those procedures and laws? How do we ensure they don’t become politicized?
To ensure they don't become politicized, any new positive freedom should require a 2/3rds approval by the government (and for the people in the US that means you need to figure out multi-party or this is gonna suck) and removing a positive freedom would require 3/4th approval by the government.
The procedures and laws should be handled and drafted by a separated government branch, which is dedicated to protecting the freedoms granted by the constitution (as well as protecting the constitution of your country itself). They substitute prosecution in case of violations but do have to go through the same courts as everyone else.
To ensure that this doesn't escalate for person-on-person disputes, generally they should only prosecute those who are threatening to oppress or have oppressed a group of people or a person for being part of a group of people under protection from the constitution (like their sex, gender, economic background or skin color).
Then there’s the question about your so-called “nonpositive rights”. What does this include? What does it take to remove these?
Your vision of the future here is terrifying, and I will personally fight against a truth dictator and the removal of rights with every ounce of my being.
For example, owning property is a negative freedom, because the state must not act against your property to ensure this freedom.
Being free of violence is a positive freedom, as the state will have to act to ensure this freedom (by sending a police officer when you dial 911 for example). In this note, not being a victim of theft would be another positive freedom, as the state will act to prevent it or redress you as a victim.
Negative rights don't have to be removed, as you fear, they're simply rights that the state can passively guarantee without having to interfere. Generally, such negative rights/freedoms don't require protection from the state, (hence they're negative).
On the flipside, the positive rights and freedoms do need to be protected. You have a freedom of speech/opinion, which is positive in that the state should act that you can enjoy them. If it were a negative freedom, then they could be lost at the toss of a hat the next time a truth dictator comes to power, as they aren't required to be protected.
So by the very nature you say you fight the removal of these rights, you're already reinforcing that freedom of speech is a positive right. (I don't even get were truth dictator comes in?)
To point out, there is gov departments in a few countries that already do what I describe or very close to. While generally not perfect, they have been useful in digging out neonazi groups and fighting for your freedoms more than the armies of those countries.
