It's not scapegoating new players, it's new players that refuse to communicate before charging into a boss or pull they have no clue what to do with.

Anyone should have learned this by the time they are level 20 after completing sastasha, copperbell, tam tara they could easily see that is how dungeons work with bosses and single enemies behind these purple lines normally have something different about them, at level 44+ there is no excuse since by that time if you have never even communicated before there is a problem, not to mention I'm pretty sure on some quests between 1-50 you will have had to type something in /say to do a quest to a npc.

At level 44+ you should know
How to communicate: use software keyboard (ps3/4) or normal keyboard (ps3/4/pc)
When to communicate: start of dungeon, purple lines before bosses where most people stand and wait.
What to communicate: I'm new, any help, if you really struggle use the auto translate (please assist) (whats the battle plan?)

I cannot clear the dungeon for them myself, especially if they are a tank or healer. My issue is not with them being new nor is it to scapegoat them but to point out that very early in the game people should already know some simple etiquette with running dungeons. It helps for the new person to identify themselves as some jobs have different things to do in different fights, its pointless explaining a boss fight from a tanks perspective (what to stun etc..) when the new person is a healer and needs to know about using esuna on a certain debuff