Saying Voldemort's name

[Jenny T. Malmiola]

No: HPFGUIDX 19171

I just began reading PS again and this hit me:

" 'My dear Professor, surely a sensible person like yourself can call 
him by his name? All this ""You-Know-Who" nonsense - for eleven years 
I have been trying to persuade people to call him by his proper name: 
Voldemort.' Professor McGonagall flinched, but Dumbledore, who was 
unsticking two sherbet lemons, seemed not to notice. "

1. I think James, Lupin and Black are using name Voldemort because 
they've been very close to Dumledore, who has "been trying to 
persuade..."

2.Can we because of this assume that everybody who uses name 
Voldemort are close to Dumledore? (Of course many wizards close to 
Dumbledore are too afraid to say it, like Professor McGonagall. 
Though I think some of them would propably feel courageous enough to 
say it when they're with Dumledore, but not elsewhere. And IIRC, 
wizards on the Dark Side say Dark Lord, not Voldemort. This has been 
discussed.)

Jenny