I have never understood how rarely attacks occur. I think of the places I visit in London, and the volume of people, and I conclude that there is simply no sho

I have never understood how rarely attacks occur. I think of the places I visit in London, and the volume of people, and I conclude that there is simply no shortage of opportunity to create casualties of at least 3 figures. So my question becomes, do the supposed large swathes of angry terrorists not want to damage it in traditional terrorist attacks, or are they being prevented from doing so by the security services, surveillance and border controls etc. I genuinely believe that some attacks are being foiled though whether it's 1 a year or 1000 a year is extremely unclear.