Felon let me ask you these questions:
Is it alright for the writers to kill ethnicities in mass number within the US? If not then why is it alright (and not racist) to kill them in mass numbers within their own home nation when its being done for entertainment value?
Your questions are skewed because they each incorporate your contention that minorities in Heroes are targeted in mass numbers specifically and exclusively. You are using your conclusion as an argument, so the rationalization is circular.
The objective way to phrase a question is like so: "do the writers of Heroes kill off minorities specifically and exclusively?" An objective answer is that lots of white people die in Heroes--too many to even try to list. So, "no".
Are you also asking if it's OK to display the taking of life as entertainment? That's a separate conversation. But as I've also said, minorities aren't minorities in their homeland. If a goon is killed in feudal Japan, it's probably going to be a goon of Asian descent. That's not an anit-Asian agenda. That's just what reasonable people expect.
Beyond those minutemen (who were killed purely for political reasons) where are all the random Americans which Maya killed by using her power? If Maya only learned how to control her power after a two night stay in New York State, then shouldn't there have been more random deaths? After all, you can't take a 1 - 2 week drive from Southern Mexico to New York without stopping for gas, to use the restroom/shower, buy food/eat, etc. So logically there should be more deaths not just those which occurred in Honduras, Mexico and Guatemala.
The objective question here would be "is not showing additional airtime of Maya killing more white people evidence of racism?" The answer is "it's not hard at all to think of other valid reasons, so no it isn't".
In the context of the story, her power only activated when she was under extreme duress. The power doesn't just go off randomly. Once she got past the minutemen--which is an incident that counters your argument handily despite your attempt to sweep it under the rug--she was relatively safe. Beyond the context of the story, it's a pointless waste of time; once we know how dangerous her power is, it's time to move on.
Lasty, is it possible to tell a Samurai story about an immortal legendary warrior without there being any fatalities? Personally, considering that Adam was immortal, I find him defeating his opponents using his wits and not through death to be a more compelling story. Then him just killing other samurai and continually dying then resurrecting until all his enemies were dead.
It is possible to tell a samurai story without fatalities. It's kinda boring--because samurai stories without duels to the death are like westerns without gunfights--but possible. Then again, I don't recall Adam carving out massive carnage anyway.
The more fundamental question here is "is having Japanese people die in a samurai story evidence of racism?" To which the answer is "no". An althernative question is "is setting part of Hiro's story in feudal Japan evidence of racism?" To which the answer is "no".
There is plenty of evidence to counter this notion of a racist agenda--Hiro and Ando's continued prominence, for instance, or most minority characters serving on the side of good--but you seem to keep finding ways to discount the evidence.