Similar to the documentary of those flat earth guys that try to disprove the earth is round, but all results show that it in fact is, so they dismiss their own evidence. That is what is unscientific.
So no science is not finished and yes our understanding of science still progresses. However, two things first it does not need "sceptical dissenters" to progress science. There are many areas in science where there are many "known unknowns" and where there isn't an established theory.
Moreover, even acknowledging that there are areas where "sceptical dissenters" might be right and change the established understanding, those will not come from a direction of questioning and ignoring the scientific method.
In other words someone ignores the scientific method he/she is not a legitimate dissenter.
But you need to be more specific ("butter bei die Fische" is the German expression), what are legitimate dissenters and how do you judge them as legitimate?
Are you talking about dissenters that argue by politics and own wishes? Or dissenters who have alternative explanation of history? I dont know.
I'm a literal lab rat. Late 80s, my disease and the treatment had 95% mortality within the first year (BMT for aplastic anemia). I've had dozens of complications, some life threatening, all miserable. Most recently, I was the 3rd patient to undergo a novel way to use whole body radiation to beat back an autoimmune disease (TBI for chronic GVHD).
Sure, a lot of my care providers have sucked. And insurers would prefer I'd just die already. And I've definitely been grumpy.
And yet I'm still alive and kicking.
Life is a gift. Every day is a celebration.
It's very, very hard. But if at all possible, I encourage you to find a way to transmute your anger and outrage into action.
For a while, I channeled my energies into healthcare IT and election integrity. Before that, I cosplayed as a treehugger, trying to save endangered salmon. Maybe I did a little bit of good, nudged the needle.
Was it worthwhile? No clue. But everyone needs a hobby, so at least the work kept me distracted.
Not surprising at all, this is generally the time when people see the incompetence, arrogance and lack of integrity of the 'experts'. From then on all expert opinion is suspect.
At different points in history, different political groups were stuffing their ideas down people's throats claiming it all is based on science, religion or bright ideals of democracy as given to us by the founding fathers.
More often than not it was bullshit. What a pity!
[EDIT: slightly reworded]