To sin in private is not to sin at all

Tartuffe seems to be on par with the obsession with ocular proof we saw in Othello. For Tartuffe, it seems that it does not matter whether one sins or not, but whether or not the public sees it. This naturally leads into a discussion of masks and appearance and who he really is or who you really are.
Someone once told me that perception is reality. This person happened to be someone of prominent status in my hometown (I know, big freaking deal) and ended up needing to leave his job after certain revelations came about of his personal life... I never liked the man and knew that perception wasn't reality- his high profile and respected job didn't fool me, I knew the guy was shady. But for a long time, his mask worked. This also reminds me of Bernie Madoff, a man who wore the mask of successful and respectable and trustworthy businessman... And then I am flooded with numerous examples of the mask-wearers that populate our world. And then I wonder how many more are out there? I think we all wear masks, sometimes we might not even know it.
Is it always bad to wear a mask? What about when I have an interview and "sell myself" with my "confidence" and total assurance that I can definitely handle this job? Is that bad? Or when I put on a happy face for someone, when I really know that their situation is only headed for rock-bottom? That's a mask, but is it okay?
Tartuffe wears a mask that represents many people... Moliere's work is a critique of everyone- he makes fun of us all that wear masks, and when we are fooled by them...
Have I gotten too cynical?