I thought all your research had possibly been at the local level. Thanks for clarifying that.
So... you truely don't see why doing "research" on peoples opinions of taekwondo at a taekwondo event will tend to bias the results?
You know, I bet if you survey people at a bar, they'll have lots of good things to say about booze. Interview people on certain street corners and they'll have all kinds of nice things to say about meth.
I suspect you know this already, and you're being willfully obtuse.