BBC's Confused Use of "Terrorist"

If a vicious villain blows himself up, taking innocents with him, he's a "bomber" to the BBC. But what if the police mistakenly shoot someone suspected of being a bomber? Well, then he's a "terrorist:"

Officers shot dead Jean Charles de Menezes, 27, in Stockwell, London, on Friday, thinking he was a terrorist.

So police mistakes garner the T word and actual events garner only a B? This is getting confusing ... biased, even.