To wait or not to wait


Given all the recent additional security in flying, the airlines are advising folks to arrive three hours prior to departure when flying to the US from abroad. 

Today in Paris, our departure was delayed about two hours as we waited for people to clear the additional security.  Now, I had a one hour connection which required the obligatory hike from 2F to 2E for my flight and a re-clear of security and I managed to make it with at least 20 mins to spare. 

As I sat on the plane and the crew updated us as to how many more folks we were waiting for, I couldn't help but wonder if it was fair to the folks that did heed the warning and did what they were told to be forced to wait for those who didn't. 

While I understand both sides, I am on the fence about it.  On one end I feel it should be treated as any other situation and if you're not at the gate, you're not on the flight.  But on the other hand, it is an unusual situation and there are always exceptions (but I still belive waiting an extra two hours was a bit much).

I'd be interested to hear what others have to say.