What I don't get about todays arrests of the the 'sucide bombers'

They were willing to kill themselves by blowing themselves to pieces ...

Yet when armed Police turn up outside they let themselves get taken alive?

Surely they run out pretending to have another device and get shot without then facing interrogation by the authorities?

Why be willing to die in an explosiion but not when cornered?

 

but wasn't it only the press that labelled this lot suiceide bombers? Didn't two of them throw bags onto the tube and run off?