Because in the end it's not your problem and none of your business lol
Feel pain sure, we all do, but sometimes the level of carry on in here is as if someone was coming up to you everyday and asking you for advice constantly then blatantly saying to your face you are wrong. The only problem there is the time sink.
I also feel that pain about people obsessing over macros etc, I was the skinny dude too, 65kg wringing wet, and I took the advice offered and applied it. If they ignore it and get no results, and don't have enough brains to realise they must do things differently, well tough titties to them, enjoy being a rake.