They had already shown what their industry was being used for in Nanking so the sanctions were eminently justified for those who don't want more of it.

It was beyond the pale and appaled even imperial powers whose other history included things starting like the Opium War, passed the Chinese Exclusion Act and putting down the Boxer Rebellion.

Given that military action caused it that is a rather egregious to complain about the resulting sanctions and even worse to claim causus beli over it.