Absolutely. I confirm my opponents' calls, for exactly the reason you say. I never, ever 'fess up to this after the match, though.
In addition to making sure my partner doesn't run aground worrying about bad calls, I think it is good for interpersonal relations. If I act as though I trust their calls, they are more likely to trust my call.
-- Random Error Generator, Version 4.0
-- Master Moonballer