Protection for EVERYONE at Hogwarts

[lizvega2]

No: HPFGUIDX 89800

I'm remembering the scene in OOP where Umbridge is trying to boot 
Trelawney. Dumbledore didn't seem at all perturbed by Umbridge 
sacking Trelawney, only that she was trying to remove her from the 
castle. We learn at the end of OOP that, as far as DD knows, the 
woman has given two predictions. Two predictions yield sixteen years 
of income and security teaching a subject that DD wasn't sure he 
even wanted to continue at Hogwarts. IMO, Hermione and McGonagall 
are right in their estimation of the subject: it's rubbish. I think 
DD keeps Trelawney at the castle for her protection. LV's informant 
was thrown from the Hog's Head half way through the prophecy, but 
surely he/she saw who was giving it! Pretty good reason for DD to 
give Trelawney a job all these years isn't it?

Snape. DE, or reformed? Regardless of the speculation, all we know 
about him is that he WAS a DE, according to DD, and he now teaches 
at Hogwarts, obtaining the post of potions master right before LV's 
fall. Why did DD do that? Why did he allow him to teach at the 
school? Perhaps 'allow' isn't the right word. Maybe we need to be 
broaching this one from the same perspective as Trelawney, 
protection. Before LV's return, how many former (Free) DE's sat 
around talking about the old days? Is their any reference to Snape 
and Lucius discussing the Dark Lordthingy? If Lucius and whoever 
else believed that Snape had turned traitor before LV's return, 
wouldn't he need protection also?

Flitwick. Some have argued that he's half elf. The apptitude for 
charms, the short stature, the squeaky voice. I don't think I've 
been able to find a consensus on non-domesticated house elves, but 
if there isn't such a thing; if all elves (Half or less) are 
required to be subservient to wizards, wouldn't it be reasonable to 
assume that if people were to know his true heritage (Sound like 
anyone we know? Anyone, say taller and wider than a 'normal' man?) 
wouldn't he be in danger of being 'enslaved'?

Fierenze. This one's a gimme. He came to Hogwarts to help out DD, 
and now he can't return to his home in the forest. The castle 
definitely serves the function of protection for Fierenze. 

Hagrid. He was allowed to remain at Hogwarts after his expulsion in 
his third year as gameskeeper. But, really, where else could he have 
gone? His dad died, his mum was off in the mountains. Perhaps he 
could've gone to join her. But, if Hagrid's 'tale' is accurate, how 
long would he have survived living amongst creatures even bigger 
than him? And, when Hagrid came to get Harry in the beginning of 
Book 1, the people on the underground were extremely wary of 
Hagrid's size. So, living as a muggle, like his dad, is pretty much 
out of the question. Where else could Hagrid have gone?

It's been emphasized over five books just how safe Hogwarts is. 
We've seen the castle used as a hiding place for the philosopher's 
stone in book 1. Not to mention Harry. Harry is safe there. I just 
don't think he's the only one benefiting from it's many spells and 
enchantments and 'protection'

Can anyone else think of someone who may have may have been placed 
at Hogwarts for their own protection?

McGonagall? Sprout? Pomfrey? Vector? Filch?