Perhaps for the same reason London police shoot innocent people in subways?
http://www.cnn.com/2005/WORLD/europe/07/23/london.tube/
I used to take the subway from that very station twice a day.
That was pretty disgusting too, and I blame Blair for licking Bush's arse despite having the undeniable intelligence to know better, which in a way, makes Blair 10 times worse.
Seems the police were watching the guy's flat, and the supervising copper couldn't be arsed and went off for a piss or a jazz mag or a curry, and our guy calmly walked out and took the bus to the tube.
Cue major panic and shooting.
Especially foul was the way the police released to the papers all the witness stories about seeing a bloke in a heavy padded jacked run in and jump over the stiles and run down and leap onto a train, with a pack of coppers in full pursuit.
Eg. in the article you linked to. It's all lies, dirty cop lies and cover ups.
It came out in the investigation a few weeks later (actually it was leaked by the complainants dept cos they were so disgusted) that the police knew full well at the time that the heavy padded jacket guy was actually one of them, an armed undercover copper.
He was the one who did the shooting, and the suspect had actually walked in calmly 5 minutes before, brought a ticket, gone through the stiles, and waited patiently for a train before getting on. All the time with another undercover cop following him and right next to him.
When the alarm went off, this copper that was already there grabbed him and held him down, then Mr Padded Jacket Maniac burst in and shoots him 5 times in the head. The holding down copper was pretty pissed off too and said so in the investigation. Apparently he nearly got shot too and went deaf for a while.
The police realised straightaway they'd ****ed up and released a bunch of misleading statement to the media and international media and smeared the dead guy to hell and back. They also tried to claim there were no CCTV cameras at the time.
Bollocks. I know that station, and there's 15 or so cameras. The police stole all the tapes and tried to wipe them, but one turned up later, ****ing up the police story.
Sorry to go on about this, but I was pissed off about it.