Grammatical corrections are in red and stylistic suggestions are in blue.

I'd give my life for future generations of Tibetans.

Please don't say that Buddhist Tibetan clothes are dirty or not washed, because their hearts, more than anything, are clean! They clean the soul and have dirty clothes, but some have clean clothes and dirty minds!
　　
But for the national policy provides for the development of tourism in Tibet. I really do not appreciate those who have no faith or people of bad faith, to enter this territory.


Please don't say Tibetan people are stupid. In fact we are the smartest thing, try to leave something for children, and do not advocate "run out of" the idea! (I don't understand what is meant here)
Please do not ask what is our last name (I don't understand this phrase either). We believe the Buddha!
Please do not say that Tibetans do not have self-reliance, because we rely on brother provinces and municipalities such as ~~, because the first time to break the isolation of our situation, not our own!

Please do not say that in fact, Tibetans are subject to you. Please understand that we have a unique beliefs, and do not want anything to pose a threat to anything on our faith! Please don't say Tibetan and Putonghua is not good or something. And even that was only our second language in Putonghua! (Do you mean "And Putonghua was only our second language!") 
　　
Also do not forget that after we fell into this room that the Tibetan language is the first language (don't understand what you mean by "room")! Please don't bring your so-called gentlemanliness, civilization, science, fashion, and "well-off" values to Tibetan areas, because Tibetans know how to pray for everything!
　　
Instead of for yourself! (Do you mean that they do not know how to pray for themselves?) 
　　
Please do not apologize because some Tibetan stares at you with a look, or calls you a word you don't understand, apologize. It's just that they are at least able to alert (This word is confusing here. I don't know what word you were looking for)! Please do not present our beliefs as superstition, because saying "you don't understand is that fan, I know is (maybe you mean "Whatever I believe that you don't understand, this is called superstition"), this is called superstition! "If possible, I'd give my life for future generations of Tibetans.

Hi, I really like this. I could really feel your emotion and it moved me to compassion towards the Tibetan people. Unfortuately, there were a lot of phrases that I could not understand the meaning of. I didn't want to put words in your mouth, so I left those phrases as they were and added a note in parentheses.