You do have some points here.That's not dystopian to acknowledge our dark side. That's ridiculous.
Definition of dystopian: of, relating to, or being an imagined world or society in which people lead dehumanized, fearful lives.
So, all of human history is dystopian? O_o
Sorry, but I like my Star Trek were the negative is acknowledged and humanity is shown to have choice:
ANAN: There can be no peace. Don't you see? We've admitted it to ourselves. We're a killer species. It's instinctive. It's the same with you. Your General Order Twenty Four.
KIRK: All right. It's instinctive. But the instinct can be fought. We're human beings with the blood of a million savage years on our hands, but we can stop it. We can admit that we're killers, but we're not going to kill today. That's all it takes. Knowing that we won't kill today. Contact Vendikar. I think you'll find that they're just as terrified, appalled, horrified as you are, that they'll do anything to avoid the alternative I've given you. Peace or utter destruction. It's up to you. (emphasis added).
ETA: One of my favorite ways to illustrate this is via a song:
And no, I don't consider human history dystopian.
But there have been periodes when it comes close to that.
And sometimes I just get tired of having it rammed down my throat.
As for Star Trek, I think that DS9 had the best mixture. It had episodes which could be considered as dark and gloomy from time to time.
But there were always "lighter" episodes between them and even in the darkest hours, there was a feeling that the good side would prevail.
That's what I want!

Not downright dark stories of people living on or leaving a devastated Earth or doom-and-gloom and destruction just for the sake of it.