Are we so modern that we accept a barbaric act because it's perpetrated by someone who has a thin veneer of civilisation, yet we condemn those who defend themselves against it because they don't have that veneer?I'm English so a home invasion is not always a cause for execution.
Maybe one of the good things about human development and the comuniative advances of the last 5000 years, is we don't always kill on sight.
The cerebellum has advanced to the point where we install post crime solutions and a legal system to avoid the insta-judgement of those afflicted by the crime.
I respect these folks culture, but they killed some dude, if wanted in there space or not, huh, but they killed a person.
How modern are you willing to be?
If not I will personally post out a spear and animal skin costume to you and then you can then be as bararick as you like in your society, good luck with that.
That dude was effectively attempting genocide (due to the issue around those folk's lack of immunities and vulnerability to disease). Whether deliberate or not, that's what his actions amount to.