He makes an uncomfortable point though.
If this is is the start of a new form of terrorism, where a couple of motivated individuals can take out a few people anytime, anywhere, it's going to be virtually impossible to guard against. If people could be impelled to carry out attacks like this with far greater frequency the country would be a basket case within months. I don't know how many would be jihadis are prepared to chop people up in the streets but I doubt it's just these two.
So it's important to find out whether these guys are freelance fucksticks or part of a wider, more sinister outfit. If it's even suspected to be the latter it's only a matter of time before a communications data bill is passed because prior intelligence is pretty much the only way the authorities have any hope of preventing this sort of attack.