Should I stay or should I go?

Reasons why Sir Ian Blair shouldn't resign in the wake of the Menezes shooting:

July 15th - no-one died
July 16th - no-one died
July 17th - no-one died
July 18th - no-one died
July 19th - no-one died
July 20th - no-one died
July 21st - no-one died
July 22nd - someone died
July 23rd - no-one died
July 24th - no-one died
July 25th - no-one died
July 26th - no-one died
July 27th - no-one died

....I could go on.