Do you really think that is justified?
It does not even matter, whether its justified.
It matters that:
- few people of Japanese heritage went on revenge killing spree in US
- few people of Vietnamese heritage went on revenge killing spree in US
- few people of German heritage went on revenge killing spree in US
- few people of Korean heritage went on revenge killing spree in US
- few people of any South or Middle American heritage went on revenge killing spree in US (while the US did not drop many bombs there, interference in the internal affairs of south and middle american countries has been OFFICAL US policy for decades)
- few people of any Chinese heritage went on revenge killing spree in US (while it is not official policy, unofficially the US has since decades been prepared to go to war in regard to the by many Chinese considered as separatist Taiwan)
So going on a "you bombed the country my grandparents came from, therefore i now mow down civilians with a truck"-killing spree is something pretty unusual and out of scope; the logical thing to do, would be to look for characteristics such people have and which all those non-murdering Japanese, Vietnamese, Germans, Koreans, Chinese or Latin Americans in the US do not have; and then look closer into these charateristics to understand whether they are relevant for this realy, realy unusual behavior.