By showing that the Republicans are worse, like I said. Biden is factually enabling genocide in Gaza, yes. The answer isn't to support Israel, of course, but to show Trump's track record of foreign policy blunders that would lead to acceleration, as a quick example.

If this theoretical leftist genuinely believes there's no difference, they likely haven't read theory, are a fed, or are only interested in virtue signaling and genuinely won't be harmed by Republicans anyways.