I think that these sort of situations we have been having since 9/11, are a bit more complex than just "politics of fear".
True, there is always an ingredient of political manipulation of fear, but there is also an ingredient of true concern.
Lately I perceive some sort of women reluctance out of their legitimate right for privacy. This legitimate right for privacy is to be respected, in my opinion. Should we abstain from now on from street photography of women ? Not at all, but when a woman protest I would explain myself and even delete the image if the protest continues.
This new world order in which we are less and less allowed, also endangers the survival of our street photography genre. Thsi is a red light that I do not accept, at the same time that I would deal with each situation in a specific way.
Meaning that I photograph whatever I want, conspicuously, and no matter any explicit prohibition, but at the same time out of awareness towards the fears of common people, I would be ready to retreat when specifically asked.
Specially concerning children, we should not ignore current adults paranoia. I also hear radio daily and cannot ignore the myriad of sexual or/and violent abuse taking place in a growing brutalized world. Therefore I am not sure I will go to a public square to take pictures of children playing, in the same spirit that by evening/night when I walk and there is a single woman before me, walking in the same direction, I either walk faster or slower, in order to let her clearly feel I am not after. Just common sense.
But on the other hand I know by experience that at some places when there are water fountain sculptures and a lot of children inside, the general spirit is of joy and clear understanding why this is a special photographic opportunity and an ocassional photographer like me is harmless.
Finally any AF camera will enable a lot of conspicuos picture making, and any Panasonic G with both a flippable back and a great electronic viewfinder will be an astonishing instrument for both conspicuous and unconspicuous photography.
Cheers,
Ruben