As far as the Guyger case goes I guess I'll need to get some more details, but I don't see how walking into a man's home and just blowing him away because you were "confused" merits just 10 years.
As far as this latest situation goes, it's not acceptable, a strong message has to be sent. I know cops, I know it's a hard job, but that officer gave that poor woman no chance, he did not announce himself or his intent. Anyone that encounters someone unexpectedly on their property at 2:30 in the morning is going to be flustered and surprised at first and need a moment to figure out what's going on.
Two innocent people gunned down in their own home for doing nothing but being in their own home.