Just so we’re both aware, tumblr user twilightsparklesharem, there are real human writers behind the stories in New Trek. Writers who live in our society and have real world biases and I, as a mixed disabled LGBT person directly affected by said biases, am allowed to criticise how those biases come through in their writing. And they do come through, verifiably.
Look how Michael Burnham has to suffer trauma after trauma and fight tooth and nail for her right to captain the ship while a white woman, Tilly, gets made first officer as an ensign with no questions asked. Look how Book had to suffer the loss of not just his entire family, but his entire planet. Look how Adira, a nonbinary person, had to watch their boyfriend, an Asian trans man, die in blood right in front of them. Look how Raffi Musiker, the only Black character in Picard, is depicted as a drug addict and an alcoholic and a deadbeat mother. Look how Hugh Culber, an Afro-Latino gay man, was killed and brought back all for the emotional character development of his white partner. Look how Philippa Georgiou Prime, Star Trek’s first Asian woman captain, was killed off in episode one. Look how all of the background characters on Discovery are people of colour, while the most developed characters like Tilly, Stamets, Detmer, and Saru (yes, Saru counts) are white. Look how even Uhura and M’Benga in SNW are not free of some very horrible tragedies being heaped onto them needlessly. And yes, look how Hemmer, the only disabled character in SNW and only the second disabled main character in all of Star Trek, had to kill himself once he realised there was no hope for him, and died a tragic inspiration to the Enterprise crew. Notice how these events of extreme tragedy or violence never involve or directly harm the white, straight, cis, and/or abled characters. Pike worrying about his future or Una dealing with being an augment is not even close to what Michael Burnham alone has had to go through. I promise you, these events are not happening in a vacuum. These writing decisions are not being made in a vacuum. They are not being experienced by the viewer in a vacuum, either, for that matter.
You must understand how watering the things that happen in these shows to “it’s space, people die” is a far more meaningless and yes, unhelpful, than critical examination of how the writers’ biases, be it racism, ableism, transphobia, homophobia, or general disregard for marginalised people, affect the events that take place in the show. It is not a stretch for me to point out that there is now a pattern of marginalised characters being exposed to suffering far more frequently than anyone else. And there are reasons for that which go far beyond “it’s space” or “it’s science fiction” or “good people die in stories all the time”. Saying such demonstrates what I can only describe as a massive lack of understanding on your part of intersectionality and how writers’ real life biases affect the things they write.
Hemmer did not die because “it’s dangerous in space”. He died because the writers made the decision (from the start, I might add) to kill him off in their story. I am allowed to wonder if the reasoning for that decision had ableist roots, particularly given New Trek’s existing track record.
As an aside, I am frankly bewildered by your assessment of SNW’s diversity. Pike is a white, cis, straight, abled man; nothing about that is “iffy” and I am at a loss as to how it could be. Sam Kirk is also a white, cis, straight, abled man, in case you forgot about him. Spock is a white, cis, canonically straight man (I won’t say abled, but at the same time they seem to have forgotten about his dyslexia, which hasn’t been brought up since Discovery). Una and Chapel being women does not preclude them from also being white, cis, and abled, and in Una’s case, straight. As of now there is only one confirmed main LGBT character on SNW, Chapel, whose bisexuality was confirmed in a blink-and-you’ll-miss-it moment. There are only three characters of colour, Uhura, M’Benga, and Ortegas, against five white characters (six if you include Hemmer). Again, from what you’ve written here, I don’t think you have a good grasp on intersectionality and how it affects things like race, gender, and disability.
If your interpretation of anyone trying to address real instances of racism, ableism, transphobia, or homophobia in television is that they are trying to “politically justify” not liking something, you really have some learning to do, and that’s as polite as I’ll be about that.