Basically:
The speaker states that he moved to the USA from China.
The Chinese government shot peaceful protesters several years ago at Tiananmen square and he was there.
He wished that at that time they'd had rifles.
Freedom is not free, liberty has costs.
Absolute power corrupts absolutely.
The Chinese Constitution says that they have the right to enjoy freedom of speech, religion, and other rights that cannot be taken away without due process of law. Those things sound nice but are not worth the weight of the paper they're printed on. The government has all of the guns and has all of the rights.
A rifle is not for sporting or hunting. It is an instrument of freedom.
It may be a small step to give up your rifle or 30 round magazine but it will be a giant leap in the destruction of this great republic.
He closes his speech with a quote from John Parker:
“Don’t fire unless fired upon, but if they mean to have a war, let it begin here.”
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Basically this guy is the opposite of Piers Morgan, who is a complete and utter moron.