I'm not convinced that Harris is the least worse option. Trump's initial response to the invasion of Lebanon for example was an outright condemnation and call for a withdrawal. Of course with Trump it is difficult to say what he is about, because he just says anything and everything.
One thing that is clear is that Harris, like Biden, is a committed Neo con. Like the bulk of the American establishment they are hell bent on regime change in Iran and Russia to 'surround China'. Trump is not such a true believer and vacillates between so called 'realism' and isolationism. Last time, when push came to shove, he sidelined Bolton and didn't attack Iran. His preferred option is to negotiate from strength to impose a deal that benefits him. The neo cons just want to use the US military to remake the world in their interest. It is why Cheney and Bolton and so on are behind Harris.
It is not to say that Trump will end things if elected, but if you think that it is appropriate to chose a candidate at all, you want to chose Trump and not the one that will write 'Black Lives Matter' on the bombs.
The real truth of the matter is that no one in Lebanon or Gaza would vote for either of them and neither should you. You should work to build a transnational movement of the oppressed seeking the liberation of all