But there was a personal reason in this instance. Riker felt violated. And he was right about that. The Mariposans cloned him without his consent. But does two wrongs make a right?
My point was that we know of our characters that they don't routinely execute living beings, only based on their personal reasons. That
coupled with the fact that the episode never presents the clones as alive or even suggests that they are alive, we can safely determine that our characters aren't killing beings, right then
I'm going to have to start making my posts in long, unbroken, single paragraphs, so people have a harder time taking excerpts of what I've written out of context lol.
Speaking of taking things out of context, you're taking that whole incident out of context
Apparently the Mariposans didn't have the abiltity to enforce their law against Riker, so Will got away with it. Plus the mariposans probably committed a crime as well when they took Will's Dna without his consent. I suppose, with that in mind, the Mariposans let bygones be bygones.
That's all supposition. Nothing was said to indicate that any of that happened
In "Justice", Picard openly admitted that he would be violated the prime directive if he were to save Wesley's life. He had a personal stake in the matter, especially with Beverly nagging at him. As you know, Picard went on to violate the prime directive.
In "Pen Pals", Picard had no problem with letting that alien girl and her people perish because of the prime directive, but Data had a personal stake in the matter. Ultimately, Picard allowed Data and the Enterprise to intervene to save the girl's planet and people, it seemed, as a favor to Data.
In the case of Riker's clone, I don't doubt that Picard was sympathetic to Riker and so did not raise any issues with Riker destroying the clones.
And yet, in those other cases, an entire episode is dedicated to openly addressing their ethical conflicts. However, not only don't they afford a whole episode to addressing this Mariposan situation of Riker incinerating the material in two of their cloning pods, it doesn't even get brought up, ever again, by either party, in the very episode it's in. The context suggests it is of no consequence
BTW, he didn't intervene in Pen Pals as a favor to Data. He did so because it was the ethical thing to do
When the Mariposan prime minister burst into the lab and saw Will destroying the clones, he yelled out "Murderers!"
Ok, so here's your point, I'd think. Bear in mind, Will is the only guy here brandishing a recently fired weapon. So, there's only one so called murderer, but Granger calls them all murderers, & he does so because the issue at hand is not the destruction of the gestating clone bodies. The issue is that they are going to die out without more clones. That's what the rest of the dialog is about. Granger's point,
in context, is that by actively denying them clones, all of them are murderers, killing ALL the Mariposans, by not letting them steal DNA. The actual incineration of those two clones wasn't even addressed as a crime itself, by anyone, because the conversation isn't about that.
& even if you can conveniently single out the one word, from a biased source, taken out of context to the scene, & say he actually meant the present destruction of those two clones, how is that a solid basis to say that it's actually true? It's one biased guy's remark. He'd probably say phasering those things was murder, even if they were still goo in a petri dish, because he already considers them an important part of their society. That dude's claim holds no credibility, no matter what he meant, because we can't trust what he says
And... everything else in the episode points to it being either an inaccurate claim, or a completely unrelated comment about the crew being complicit in Mariposan extinction.
Bah... I should shut up now. This is all kind of off topic
There's one that should definitely be added to the dictionary 
