The animation is great. The style is clearly meant for humor. The lyrics was well written. My only complaint would be that some parts are out of tune. I don't know if this is intentional or not but it made me cringe so I'ma count it... Sorry.
I'm not gonna criticize the accuracy of your facts cause it's a lot of work, I'm a lazy bastard, and there are always certain degrees of certainty. Plus, for the last fact, whatever percentage of people die due to capital punishment are innocent, is significant as long as it isn't zero.
Side note: Some people rated your work poorly on the their reviews because they didn't agree with your message (don't get me wrong I said 'some'). I think that you have the right to complain about that. Reviews are reviews, reviews are meant to criticize the quality of work. If people don't like the message then they can blam it instead.