当のNHHCにはこんな記述があるよ、2年前に既出だけど

ちなみにblame=責める、咎める、ーの所為にする

記述者の謙虚さに留まらない良心が垣間見えるね

Many qualified authorities have blamed powder storage outside of the magazines as the cause, but this is conjectural and probably will always remain so.