I am not convinced that there is any meaningful distinction between "negative" and "positive" rights. Take property rights, the classic example of a "negative" right. But what are property rights but an entitlement that the government will protect your property? What use is the right to fair trial without an entitlement that the government will provide you a lawyer and select an impartial jury? What use is a "negative" right to liberty or free speech without an entitlement that when someone tries to infringe these rights, the government will protect you?