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It's a good idea anyway - as we know - but let's do it for the right reasons - protecting pedestrians and cyclists from motorised vehicles, reducing pollution etc.
After all these things kill far, far more people than attacks by deluded 'militants'.
Also (as I think you know really) you aren't going to do this without public support and practically I don't think you'd get that if you tried to introduce it on the back of these attacks - it would look like giving in.
I don't think anyone wants us to change our way of life as a result of these twats.
All you'd really be doing is protecting central Londoners. There's another 60 million people all over the country in towns and villages that would remain easily targetable.