The guys story has now changed three times since I first looked into it..initially he said he stabbed him because the cop was strangling him but they saw no marks at all on his neck..
These kids were druggies looking for a high and stupid enough to rob the informant who turned them in...went downhill from there. Heck they’re even on tape. Add into the mix they were buying in a foreign country and that’s always a huge risk.
As much as you are correct, it also looks like the cops were more than just a little bit dirty themselves -- a little free-lance enforcement for the drug connection.
The moral of the story is "don't do drugs" and especially don't do them in another country.