It would make total sense, and I also think it would actually have prevented some attacks,
for example, 12 hours after the massacre at the charlie hebdo offices, there was another massacre at the Jewish supermarket...........
I would suggest the following as a minimum;
1> Do not show any videos, audio or images of the terrorists whatsoever
2> Do not name any of them
3> Do not broadcast any information relating to their demands
4> Total media blackout on any scenario involving hostages
But then how do you get support to pass laws or get troops to help another country out when the public is oblivious to what is going on in the world ?
Also does this media blackout stop at terrorism ....maybe it then gets extended to pedo rings at high places since the media blackout law has already been created.