Agenda-pushing or a faux pas?

As discussed on the Open Thread, here's Evan Davis on last night's PM talking to the former Assistant Commissioner for Specialist Operations of the Metropolitan Police Service Sir Mark Rowley about the terrorist attack in London. Sir Mark had to correct Evan Davis:

Sir Mark Rowley: While the ideology here looks more Islamist - that looks most likely - we shouldn't forget the sort of significant right-wing that the intelligence services are dealing with. So a big challenge.
Evan Davis: Yeah, I was going to ask you that because, I mean, I think at one point we were hearing there was as much going on in anti-terror towards right-wing, far-right, as there was towards Islamists.
Sir Mark Rowley: I don't think that's quite accurate, Evan.
Evan Davis: OK.
Sir Mark Rowley: The bigger problem has always been in recent years Islamist. The challenge though is that the faster-growing part...
Evan Davis: OK. I think that's where I'm, yeah, getting...
Sir Mark Rowley: ...the faster-growing part is the right-wing, but it's still smaller. They're both significant issues to be wrestled with - one more home-grown, one driven by international factors - but they're big challenges for the police and security services.