Maybe your right, I haven't played ME2 in a while so I don't exactly remember how the scene plays out. But I still think that you shouldn't get paragon points for basicly doing a personal favor by withholding the truth.
Actually, yes, it does.
I don't remember exactly when, but in the end of ME1 or in the middle of ME2 you have a conversation with Tali and depending what you chose one of the responses leads to saying you consider her a friend.
What kind of a friend is Shepard if s/he don't support Tali when she's in trouble, even if she's wrong?
In true, what kind of friend are a person if you don't help you buddy?
Sure, you can end the friendship after the incident, punch him/her in the face for being DUMB or having a serious talk with s/he.
But you don't let a friend out in the cold and turn your back on him/her.
Or is ok to stab people in the back?
Usually I never chosed the paragon path in the aformentioned mission because even the first time it doesn't need a vast brain to see the accusations are horsesh***!
So yeah, I say the quarians to go to hell and leave my crewmate out of their political BS, because that's exactly what they are doing.
They are looking a scape goat for the mess they own created.
Remember that ALL of the judges and most senior captains known and supported the experiences Tali's father were doing, except one.
Then the whole thing blow in their faces and they want someone else to pay what's due?
F*** them.
That's what we get for a too much traditional society.
And I'm not one of the so called "Talimancers", just to be clear.