So much second guessing by people who weren't there. "Oh they're stupid because they couldn't outsmart a lady in a wheelchair." And "oh they should have used mace."
Unless you were there, I know you can't tell me that their INTENT was to kill this lady.
I urge you to check out:
http://www.taser.com/facts/testimonials.htm
Tasers are something upwards of 98% non-fatal. Guns? I dare you to find a statistic showing the fatality rates of them.
Swinging knives and hammers at your FAMILY AND police officers? TASER please!