107 year old vs SWAT

Are we not at a stage where we can disable/disarm a 107 year old man without killing him? Why can't SWAT teams tranquilize a risk, like we do an animal?

I completely understand the risks involved for the police, and am thankful that none of them were physically injured in doing their duty of protecting the public, but along with one dead old man, I'm sure their is a psychological cost to the SWAT team in, after the dust settles, recognizing that they have killed a man who was in need of help.