This is interesting because the US government has clearly been very friendly with the Saudi regime for decades, supports monarchy / authoritarianism there militarily and diplomatically, developed the petrodollar system with them which saves the average American household thousands of dollars a year and allows the US government to run a $40 trillion dollar debt with favorable interest rates. Several advantages America has over other Western nations and the rest of the world come from this partnership.

In a sense every American makes money off of Saudi Arabia and doesn't realize it. Perhaps that's something they didn't consent to so they shouldn't be held accountable. But if the petrodollar ended tomorrow, inflation in the US would spike almost immediately through currency devaluation and a bond crisis would likely follow.

The first morally logical step would be to petition one's own government to stop supporting the Saudi monarchy militarily and diplomatically.

Tl;dr: The US is the reason Saudi Arabia has international legitimacy and respect. If anyone wants to change that, start with them.