system
A chat on subreddit /r/NoStupidQuestions
human
Because 

1. he's revelling in death

2. It's bringing up missions etc that have long passed and stoking the fires so to speak

3. because of his actions there's been a few people that have had to leave the country (Afghanistan) who were doing good work out there.

4. The guys a self serving prick and is fastly beocming one of the most hated people in britain (well hates a strong word, people just can't be arsed with him anymore)
gpt
I think on point 1 he was taken out of context a bit. The quote the press used was something like "killing them was like removing pieces from a chess board", but they removed the context around it. In context it's clear he was describing how he was *expected* to view it, not because that's how he actually felt about killing people.

The other points are pretty valid though.