It could be a number of things and you have six questions to go along with the one you already posted. But to answer each one of your questions here goes: 1. How can you get smarter you ask questions and get smarter 2. You can't overwhelm the system or something because the system doesn't have feelings and there aren't enough questions posted daily anyways. 3. They could try to earn points as again there aren't enough questions being asked. 4. That is all opinion based they could be trying to change peoples mind about China or they might not be if it works it works. 5. Probably not. 

Just have fun!

I have noticed the same thing.  Ever since a few days ago when the battles began, a certain serial poster (the new one) has bombarded us with as many questions as they can over a given 24 hour period.
Kind of reminds me of the other (old one now) serial poster.
To answer your questions:
1. No, quite to the contrary these questions are asked for specific purposes.  Some may be basic survey questions and others may be attempts to gather intelligence on certain posters here.
2. Yes, if they bombard the board with questions then they dominate the conversation.
3. Yes and no, points themselves are probably useless to them, it's the status of being top users they crave.
4. Yes, this is a means of subtle manipulation of perceptions if one is not aware of the tactics and let's it seep into their subconscious.
5. No, I believe attacking and degrading foreigners is based purely on shallow vanity as opposed to purposeful negative propaganda.

I laugh at the guy who posts the same question three times anonymously, but then with his REAL username clarifies his question...

Just idiots is all. And mentally deranged. Going around thumbs downing posts is pathetic too. Like a child. 

1. Are they so dumb that they dont know anything?

Absolutely not!Some of them  are positive in helping the site to create an atmosphere which brings warmth and relaxation to our heart and attracts more people to join.They should be respected by all of us.The others may want to get wisdom from some members,as there are indeed someone  here quite cool and helpful.

2. Are they trying to overwhelm the system or something?

No,there is limit to the maximum number of questions every one could post  in each day and each week.

3. Are they trying to earn points or are they racing each other?

No,we are grown-ups and wouldn't be that childish.

4. Are they trying to prove something or trying to change how others view China?

Maybe.I think the site is a good place for us to exchange thoughts and experience.There are people from different countries and of different races,
we are affected by the media of our countries all of which are subjective to some extent,we could know more about ourselves and the others by exchange.We could get closer to the truth by discussion.

5. Are they part of a propaganda to defame foreigners?

I think you are wise enough to get the answer by yourself.

1.  Well I'm not the smartest peanut in the turd.
2.  Yeah that system is going down, I just get distracted and forget to post enough to bring it down.
3.  It's a race, I just have to take breaks to catch my breath.
4.  No reason to prove anything, if you don't think exactly how I think, then you are wrong.
5.  I'm still wait on my first check to arrive, but I think I'm doing a great job showing how horrible these laowai are.

There are three reasons why.
First they are stupid.
Second they want points.
Third they are genuinely inquisitive with a taste for knowledge.

That they must REALLY want those prizes...

Im think its the status thing.
It's most likely considered to be a step further foward towards super villian
SKITSO
can leap from underneath briges in a single personality
faster than a Cat with a ball of yarn
stronger than the smell of a side walk street vender

They've become a bore.