Protecting their own. או קנה מיד עמיתך
it might be the same but they set standards that you need to follow, even if the logic says otherwise
when I was a buchor learning in EY, i used to eat by a ruv, a baal machshir, I asked him about a hechsher if its relieble, he told me that its fine I can eat it, there was once a mistaken delivery to yeshiva with an item that had that hechsher so I told this ruv about it (I was happy to know that its a good hechsher) so he asked me if I made sure that its returned and no one ate from it, I told him what do you mean you said its good, so he responded the hechsher is good but the yeshiva has a geder which hachsharim they use and this hechsher is not one of those
so not always its kosher or not kosher, sometimes its policeis to keep it all kosher