OK, this is a dangerous comment to make, in case there is a major Islamic inspired attack in England again in the near future. And there is a bit of a difference as to the current situation, in that the previous decades of terrorist attacks at least were carried out by people with a clear, more-or-less achievable political end in view. (Whereas now, Islamic inspired nutters are completely deluded in thinking that their attacks are going to actually achieve anything of benefit for their fantasy Caliphate, or help in the Middle East in any way.)
But - I thought it still worth noting that go back a few decades, and London really had a dangerous reputation for terrorist attacks that (to my mind) made it feel riskier than it does now, despite yesterday's horrible attack.
What I'm referring to, of course, is the lengthy terrorist campaign in London and elsewhere in England run by the IRA.
I mean, just look at the extraordinary length of the list of terrorist attacks and incidents from the 70's to the 90's compiled at this Wikipedia post. While my memory was that London was in the news a lot in those decades for all the wrong reasons, the number of incidents is worse than I would have estimated.
So, yeah, random Islamic inspired attacks are terrible, but London and England will come through it.