@coldjoint,
I don't think that Islam is biased against people converting to Islam by recognizing that there is only one God and Mohamed is His prophet. What you are saying is that if a Muslim kills someone for rejecting God, there is nothing deeper to understand in that. You have clearly not fully analyzed how much higher discernment it takes to accept someone who is true believer, regardless of ethnicity, and reject liars and fakes regardless of theirs as well. From a Christian standpoint, killing infidels seems unforgiving to me, but I have listened to Muslims explain the logic of killing infidels in a way that makes sense. That doesn't mean I support it, but it is similar to understanding how Duterte, an avid atheist, would become so frustrated with drug problems to resort to killing drug dealers and users to stop that culture from destroying the fabric of society.
Morality is not as simple as condemning these acts of war. You have to understand that fighting escalates for real reasons. It's not wonderful that it happens, but sometimes the alternative wouldn't be any better. E.g. if Duterte wasn't killing drug people, the drug culture would destroy just as many lives or more. So if you asymmetrically condemn Duterte, you're failing to evaluate the drug side of the war. Likewise, if you're only judging Muslims who kill, you're not looking at the specifics that led up to the conflict and the failures to address it in more peaceful ways.
I can't defend every single situation in which a Muslim kills a non-believer in this way, because I don't know all the individual circumstance, just like I can't defend every killing perpetrated in the war on drugs without looking at the specifics of the situation. I can just say that I know there is more going on than what we read in the news or what statistics can tell us. If you were able to look at all the true facts about each case, you might find people to be right or wrong in various ways in each.
The moment someone breaks down and attacks and/or kills someone else doesn't erase everything that happened up to that point. If that was the case, you would never have an abused person break down and kill their abuser without blaming the killer and viewing the abuser as an innocent victim. So you shouldn't make assumptions about specific instances of killing and/or Muslims or Islam in general.
Finally, you talk about people getting paid/rewarded after such a killing. You don't know that the reward payment is based on religious belief or politics. If a mafia hitman kills a rival gang member and dies in the process, the mafia boss might take care of the dead hitman's family. They mafia boss and the hitman might both be Catholics and wear crucifixes on chains, but that doesn't mean Catholicism is the cause of the killing or that the Pope would advocate it in any way.