We'll never know. But we do know that his dogs were allowed to run free in a giant pack and attacked at least 6 people (probably more, but they may be locals and not ex-pats/tourists whose claims are more likely to be reported on)
If true, would certainly be a motive for those officials.
So he was looking to take out his competitors? Because he boasted of having sold 25KG of psychotropics in the previous year, so let's not mistake him for some vigilante.
And what was the thinking of the officials who allegedly received the laptops? "Oh no, the man who gave us free laptops has been reading everything we've done on these laptops. Let's plan his murder on these laptops now. Don't worry about finding his address, it's just some home north of San Pedro right? Just go kill a guy and it must be John"
I'm a big fan of Occam's razor and in this case the simplest explanation, in light of _evidence_ of which there was plenty in the documentary, is that he was not truthful.
I've never heard he killed his dogs. I did hear he thought the next door neighbor poisoned his dogs.