It's not about redact viewpoints that challenge my own, I don't put a brand new member on ignore but people I have observed for years, and many over a decade and pasts experiences tell me my interactions between us are more troubled than its worth (time and effort, and blood pressure!). In a way it is healthier not to engage, nip that in the bud by not even reading it.
We all know the one who always criticise people's purchase on everything, 1, it's a pointless exercise because the item has already been bought, 2, it's always done in a patronising way, like he knows better, on every single thing. I don't want to read that, after like a decade it becomes tedius, plus I tend to read the post first, not username and almost always after a few lines of text I get an idea who it is and look to the left and goes "why am I not surprised its him again". by that time I've started reading. I just rather not to at all.
Sure, once in a blue moon I would probably miss a gem of a post, but I am happy for that trade off vs the time spent arguing with them, or reading them. Besides, nothing they write I can't find on Google and like I said, I have read enough of their posts to know where they are coming from and frankly I know what they are going to say before they even say it half the time.
At the end of the day, there is zero difference between reading it and not replying vs not reading it at all. Both ways they have no idea whether I read it or not. It's not about being coward, but if people think somehow they are being brave behind a keyboard by reading a post, they are free to have that opinion, it's just I am also free not to agree or even read it.