Here is some quick data - a small set, to be sure, but informative. By my count, currently on the first page of the questions ranked by how new they are, all questions are by newer users (rep < 200, PSE rep < 100). There are currently:
- 15 questions on the front page
- 6 questions with a positive vote difference
- 7 questions with a zero score
- 2 questions with a negative score
- 1 has been closed due to quality
- 1 is duplicate
- 3 have been downvoted for quality (by my count)
I'm not sure what is the "right" distribution, but 6 out of these 15 questions were accepted as good. So I don't think new questions "[tend] to be downvoted" necessarily.
Otherwise, I think your concern "I think there's too much emphasis on keeping the site 'pure' and weeding out elements that aren't deserving" is addressed on the PSE tour page:
This site is all about getting answers. It's not a discussion forum. There's no chit-chat.
I think most new comers that ask bad questions don't understand this.
I think there's too much emphasis on keeping the site "pure" and weeding out elements that aren't deserving. I've also noticed this pattern on some other SE sites as well.
I would agree with this except for two parts:
"too much" - the emphasis on all Stack Exchange sites is supposed to be entirely around making it easy to find high quality questions and answers. The reason for closing/downvoting posts then isn't for the sake of those who ask and answer questions (although, the community wants to give them the right incentives), but rather for people who come along later looking for answers. In the StackExchange model, you find the question that matches yours, and then you immediately have answers to your questions. There's no need to try to re-assemble the answer from some back-and-forth dialog that includes unrelated material. However, these down- and close-votes also serve to benefit new-comers. It says to them: you're doing it wrong, please do it differently. I think people generally are pretty good here about leaving comments that describe what specifically needs to be done to a post to improve it.
"elements" - not sure what you mean by elements. If you mean "posts" (both questions and answers), then yes! We want to weed out bad answers and promote good ones, for the reasons said above. If one question has two good answers that include references, are formatted to be able to read easily, and are as concise as possible, what possible purpose does it serve to allow the third answer that is rambling, sprawling, and only cites the author's personal experience? If you mean instead "people," then that is a problem. My experience generally has been that StackExchange communities in general, and this one in particular, tends not to have much in the way of ad hominem attacks or behavior.
So if you instead were to say:
I think there's an emphasis on keeping the site "pure" and weeding out posts that aren't deserving. I've also noticed this pattern on some other SE sites as well.
Then I would say "Yes, and that's a great thing!"