Why do US presidents continue to protect Israel? The Israelis take from us, but what do they give? Nothing of any value.
The worst thing we have done is to protect their nuclear arsenal. You can read about it here:
Presidents are sworn to faithfully execute our laws, and it is the law that any country with a rogue nuclear arsenal must be subject to BDS. Yet we ignore that law and many others which should apply to them.
There is no justification for lawlessness. But apparently there are lots of excuses.