IIRC, there were several self-immolation incidents in SVN and, indeed, some were as a protest against the SVN government's treatment of Buddhists, but there were others either protesting the War outright or a combo of the war and the US support of the corrupt SVN government regime(s):
List of political self-immolations --
https://en.wikipedia.org/wiki/List_o...lf-immolations
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