I will concede the following: having checked into some of the instances listed, I did find a news article that met my criteria... BUT none after 2009, unless you count outside the U.S. (and then it's none after 2011). At least you gave it a go, unlike [deleted] there...
There were some things that I didn't particularly like about this site. Aside from the fact that this is obviously a heavily liberal-slanted website, I find it interesting that at the beginning, he states that attempted murders don't count, AND THEN GOES ON TO INCLUDE ATTEMPTED MURDERS (of conservatives on liberals, of course, not the other way around)! Then at the beginning, it says the villain and victim must be of opposing ideology, but cites INNOCENT BYSTANDERS as the victim in some cases (again, only with the conservative on liberal). It cites some murders twice (by saying there were "8 cold-blooded murders" in a "30-year campaign of violence against the rights of women to have access to abortion" and THEN LISTS THEM INDIVIDUALLY!) It lists murders that happened in other countries (which I don't think should count for our little discussion). I find it VERY hard to believe he could only find THREE liberal on conservative murderers, even going back to the 1800s as he did. And finally, it doesn't cite ANY murders whatsoever after 2011, in spite of his claim that if someone lets him know of any, he'd include them (I find it hard to believe NOBODY sent him anything to include in the last 5 years, and question that he didn't take the initiative to add any he may have seen in the news himself).
It seems the main purpose was NOT to impart an article of "high standards or [sic] truth, relevance and reliability" but liberal propaganda.