I've looked at the_donald a few times to escape my own filter bubble and it's very much censored - stuff like Trump's recent reneging on the persecution of Clinton didn't appear at all, and comments calling out Trump's lie about having saved that Ford factory from relocation to Mexico were promptly deleted. It's in their rules and that's part of the package, it's extremely controlled.
Use uneddit.com on the_donald if you want to laugh.
But the point is, the_donald is obviously biased - it's literally in their name. On the other hand, r/pol is supposed to be politics in general, ideally free of bias, so censorship there is much more deplorable. I wouldn't care if r/leftwing_pol had a bias, but r/pol should be bias-free.
Use uneddit.com on the_donald if you want to laugh.