After hearing this story, I'm totally against Quincys killing Hollows. If they kill Hollows they destroy souls, which is much worse than destroying lives, since the former is an irreversible action. Through death a soul moves to another world and maybe returns in a new life on Earth. But a destroyed soul is lost forever! I suppose Quincy could fight Hollows without killing them. The last part should be left to the Soul Reapers.
Now I come to realize with shock and horror that Ishida challenged a whole bunch of Hollows and destroyed a lot of souls 😨!!! The price of recklessness! I can't imagine that Ishida would be so inconsiderate toward other souls, so I like to believe that he didn't think things through (not that this would change the outraging outcome in any way).