Casting Stones

In previous posts I have mentioned the oppression being experienced in Tibet; this morning I have been wondering why I have been focussed on Tibet when there are so many people across the world who are having their human rights denied?  I suppose having an affiliation to part of the world so familiarly Buddhist when practicing Buddhism oneself isn't surprising, but is this for my benefit more that Tibet's?  Are my actions really right, do I understand my motivation?  There is much I can influence close to me, especially myself of course; can I actually influence anyone else about Tibet? Why am I casting stones at China when there is so much I can address within myself? I wonder what the Buddha teaches...?