I get that they are not happy with Biden’s actions, but did they really think Trump was going to bend to these demands?
Better to stick with Biden and continue putting pressure on him to secure a ceasefire.
Still doesn't hurt to try. Even if there's a 0% chance he agrees to their demands, at least they now have him on the record as being opposed to these specific demands. It provides clarity and certainty and voters will now know Trump's concrete stances on this issue, which will in turn help to better inform their vote this November.
I just never hear about Mexican-American voters being passionate about US relations with Mexico or Indians caring about how Biden is treating Modi and BJP.
Neither Mexicans nor Hindus are currently being subjected to a genocide by a hostile power on their own territory.