It's shown in Homeward. One guy was so overwhelmed by the Enterprise that he killed himself.
No that's not true, Vorin wasn't "overwhelmed by the Enterprise." The problem was this, he was give three choices, he could leave his people forever, or he could keep quiet/lie forever, or he could be regarded by his people as a lying madman.
Vorin's basic problem was that he loved his people, and he was a honest man. If the brothers Rozhenko had been completely honest with the Boraalan people, Vorin as a individual wouldn't have been place in the position of having no way out.
Vorin's suicide wasn't from being "overwhelmed by the Enterprise."
Then the Federation shouldn't be invading the space and infiltrating the societies of those less advanced.
This is where the sheer arrogance behind the concept PD is shown, the Federation obviously has a technological edge over some people. But does this automatically make them more advanced in every way than the stupid little "mud people" who inhabit the galaxy?
have warp drive, this means you
are too culturally and socially primitive to understand certain things.
Should Starfleet have to constantly have to deal with this ...
It more a case of having something happening right in front of you. If a old lady is run down in the street, you pull over and attempt to help, even if it's just calling 911. If she's hit a thousand light years away from you, then you don't pull over.
Nobody is saying you have to patrol the streets in your car, just help when you can.
In Homeward it is made very clear that as soon as the people found out about the Enterprise rescuing them, it would destroy their culture for good.
But, wouldn't everyone dying have the same effect?
And if the people survive the "whatever" they may (or may not) be able to either reform their previous culture, or create a brand new one in time.
While if they're all dead ...
Same thing happened in Who Watches The Watchers.
At the end of WWtW Picard told the "primitive people" who he was and what was going on. Bravo. He was vague in places and lacking in detail, but he was also honest.
The Dremans were obviously aware that something happened. Not just a small region, but the entire planet was tearing itself apart, then it just stopped. How primitive were they anyway?
Sarjenka, a child, possessed a RF radio capable of communicating with a ship somewhere in her solar system. That makes them what? Mid-twentieth century at least. So even if Sarjenka lived in a rural area, there were cities elsewhere and perhaps universities.
And the destruction just stopped.
So just contact them, be vague in places, but be honest.
PICARD: How about a war?
If generations of conflict is killing millions, do we interfere? Ah, well, now we're all a little less secure in our moral certitude.
And what if it's not just killings.
If an oppressive government is enslaving millions? You see, the Prime Directive has many different functions, not the least of which is to protect us. To prevent us from allowing our emotions to overwhelm our judgement.
That's from Pen Pals. In order to somehow justify the PD, Picard is force to walk down a twisting pathway of hypotheticals.
How realistically do you get from stopping a natural disaster that's going to end all life
--- to a "oppressive government that's enslaving millions," that presumably isn't going to end all life
. Where is the comparison?
Unless we help everyone, we can help no one?
I think ideally it would be left to the culture itself to state whether it would rather be changed or dead.
And this would be the advantage of straight forward contacting the people to be "saved." It possible that the Boraal in Homeward would have selected not to be saved, to die on their land. Or the village elders might have convinced the people that relocating was better than non-existence. Consulting with the villagers about the move wouldn't have require them to leave most everything behind, like they did to travel through "the caves."
The Boraal were saved for selfish reasons. Then put onto a new planet where they did not belong, which would devastate them or the planet.
If the Boraal died on their home world, or on their new world yes they would in both cases be dead, but by taking them to a new world they had a chance to survive, remaining where they were meant certain death. If their arrival meant the destruction of the ecosystem and they died from that, they still would have had a chance for life.