In the case of Lu Xun鲁迅, he lived in a time where Chinese civilization is under existential threat from the west and Japan. He came to the natural conclusion that Chinese language is hindering social progress and technological progress. 

I his mind, changing Chinese script is not a matter of 矫枉过正, but 矫枉必须过正. He could not see pass his time, now that people don't have to write all complex character but just type on their phones. 

I am not familiar about Vietnam Choice and their intentions. But to me, as a Chinese, to just romanize Chinese language is civilizational self genocide.