I can’t remember anyone justifying out of personal dislike or popularity. Their justification is that this person’s actions are mass social murder, suggesting that such anti-social people deserve to be killed if the legal system refuses to punish and deter them. The fact that people generally hate a mass killer is incidental, it’s not the reason they deserve a punishment.
There are good arguments against vigilantism in general, and while I don’t fully agree in this specific case, I respect them as valid reasons. But to say this assassin is being given a free pass simply because people don’t like the victim is absurd.
I’m annoyed that a lot of the sites I browse don’t have RSS feeds, and I’ve had to do some really tiresome hacks just to get some to work (for example, even tools like FreshRSS’s HTML parser doesn’t tell you the reason a feed broke, so there’s a dozen different things to adjust blindly until it works).
RSS saves me so much time, I used to waste hours just cycling through pages to see if any updated.