Yeah but.
Yes, we're all getting off on the WH looking like chumps for inability to spell, being hopelessly inaccurate, and being biased in selection of incidents.
But. Look what we're talking about.
People Trump-ishly inclined aren't going to care about the careful rebuttal of the claim incidents were "unreported" - or even that many on the list aren't terrorist incidents. (They've never given a shit about details like truth before, why start now?) The outcome of Angry Spice's accusation is people are seeing a list of "Islamist terrorist attacks" reported by the BBC.
It's like the strategy of forcing someone to deny they had sex with a dead pig: there's no winning play against this.