So you "jumped into this cat fight" by "speculating" on something when you had an authoritative source with good, specific information.
Let's look at a different source of different information on the same theme. It is undeniable that London Transport shut down the entire underground network on the day of the bombings right out to the ends of the lines in the suburbs. And it is undeniable that they shut down the bus network within Central London. Thames river boats continued to run right through the centre of the city and most mainline trains continued to operate except at Kings Cross station. Was this a good thing? Did it make people safer? Did it somehow limit the damage? Or did it magnify the effect of the terrorists by creating a massive denial of service effect in the city? Another data point. 3 of the bombs exploded virtually simultaneously, either through timing devices (no evidence of timers has been found) or through suicide bombers synchronising their watches. It is now virtually certain that these were suicide bombers. However on of the bombs exploded almost half an hour later on a bus. Given that there are bombs in the city ready to go off, either with timers or triggered by a suicide bomber, are people made safer by shutting down transport systems? Many of the people who died in that bus bomb were on the bus because the underground trains had shut down. And if the suicide bomber was not in a bus, where would he be? In another train? In a crowded street? Real security is tough, very tough, because seemingly obvious decisions can have repercussions many steps removed from the decision itself. I didn't feel any safer stuck in an underground train waiting to find out what was the problem. I didn't feel any safer crammed into a crowded bus after the tube system shut down. But I did feel a lot safer walking home after I realised that I was not going to make it into the city that day. Here in London, people talk a lot about business as ususal. But last Thursday, the actions of the authorities in shutting down the entire tube system and the bus system in Central London were clearly not business as usual. Personally, I believe that the best way to secure the transport infrastructure is diversity. Lots of buses, tube trains, mainline trains, trams, taxis, shuttles, cars, boats etc. If the authorities had subscribed to that philosophy then they would have kept the systems running instead of shutting them down. --Michael Dillon