Note that such a system would also prevent Slashdot from leaning left and censoring conservatives, which they're doing now by institution an idiotic "karma". Slashdot karma is all about politics. And Slashdot is left leaning. One could express that cutely as "CowboyNeal is an imbecile".
But you're not being censored. Your comment is right here, readable for all who care to engage with users with bad reputation. That you have managed to earn a bad reputation through your own actions does not reflect badly on Slashdot or CowboyNeal, it reflects badly on you. It is the consequence of your actions, in other words, your karma.
That most people ignore you doesn't mean you're being censored, it just means that they think you and your opinions are not worth listening to. That your response to this is that the government should force them to pay attention just serves to demonstrate that their judgement is completely right. It's not a political judgement, it's a judgement about you as a person.
Given your vitriol here, I think you know that too, and judging by the fact that you keep posting on Slashdot despite hating the place I doubt you're more welcome elsewhere either. So perhaps you should reflect on the only common factor for a change, try to see your self from other people's eyes and maybe, just maybe accept that you might actually be the one who's in the wrong and needs to change? It's painful, but so is eternal bitterness, and there is no government big enough to make other people like you, so those are your options.