> As I understand it, this rule isn't because we have shown it's dangerous to do the pig -> insect -> pig chain but rather because we haven't shown that it's safe.

We banned all kinds of such "forced cannibalism" after BSE, yes. And for good reason, I think - not just is it highly unethical IMHO, but because even a minuscule risk of a repeat of the BSE crisis of the late 90s/early 00s just isn't worth it. The destruction that BSE brought upon the European agriculture industry, the public outrage - I doubt non-Europeans could even understand the impact it had.