Because they're pathetic?

They're genetically predisposed to assimilation and integration and the thought of social rejection on the basis of being Asian is too much?

This is like asking why rabbits eat cabbage, it's because they come out of the womb liking to eat cabbage and die eating cabbage, with minor variations in between those two events.

Look up the risk-taking gene, it's almost 99% absent in Han Chinese people with a rate of what, like 50% in whites?