Q:

Why are many of my questions closed?

Every time I ask a question on this site, the community deals with it in a strange way, such as closing it, marking it as a duplicate, deleting it, or voting down.
I don't know that this only happens to me or happened to all.
All this feels as if someone tells you to shut up and ask only mainstream physics questions, or whatever. I do not want to change anything here
but I have two questions about this:

Is it polite to manage site like this?! Physicists are people.
Is the quality of the questions raised by this policy? As far as I can see the quality of questions on this site is very low, and has dropped every year.

A:

Without specific instances, it is hard to say. But I have looked through your list of questions available to me (you may have deleted more, but I can't see those), I challenge your assertions. 

Of 27 questions you have asked, 7 have been marked as duplicate or off-topic. 
3 of these questions were asked in 2014. 
For what it's worth, I agree with the close reasons on all of them, except maybe one, but I don't know enough in the area to be comfortable distinguishing between the marked duplicate and the edited question as posed. 
Only 5 total questions have a net negative score, all of which are at -1. Meanwhile, your most positive question is at +35. 

So, given all that, I see very little to substantiate claims of being picked on or conspired against. I also don't see anything to indicate somebody was rude to you, unless you perceive close messages as rude. 
But, to answer your two questions -- yes, this is a polite way to run the site because it doesn't appear anybody was untoward or rude. And yes, this does keep the quality of the questions up, but since there's no objective metric to define that, the discussion in that area will just devolve to personal opinions and it's not a fruitful direction to venture.

