It's crucial to remember that Castro silenced all who disagreed with him. He condemned an entire nation to poverty! His most notable achievement with regards to Africa was sending soldiers to extend the life of wars.
It's stripped of the insults to those that disagree with you and complaints of down voting. In my experience users on HN will down vote tone more often than they will down vote disagreement.
I agree it doesn't have the punch of your original post. I don't have much experience writing emotionally charged comments, though I'm sure there are ways of doing that without resorting to insults.
It sounds like you may have some personal stories to share. These would definitely add to the power of your comment, if you chose to include them.