I don't.
It is a barrier to emergency egress, crew communication (critical in an emergency), positive interaction with the passengers and fosters a sense of paranoia that before long, if not already, will become taken for granted as the 'norm'.
Yes, a layered approach is important, with the FD door as the last bastion, but ffs sake let's have some common sense applied - something lacking from management/DfT in the Pablo Mason case.
What keeps us safe is Intelligence (with a capital 'I'), not bulletproof doors. I can think of 100 different ways to take out an airliner without breaching the door, the recent convictions of the 3 bad guys show that Al Qaeda can as well. So I doubt we are any safer, it just means the baddies have to be more creative!