Hah?
As soon as hostages are released by the Gazans, they'd be truly carpet bombed!!! What's stopping a total massacre are some American/Western hostages. Even if Palestinians get their own prisoners from Israel back, a hostage swap is likely lead to a big slaughter in Gaza, unless some kind of 'guarantees' are given by credible powers.
Biden wouldn't want any Americans dead--even if of brown skin color right now--in Gaza. Because that would look even worse for Biden in the 2024 elections to have more 'Americans' killed on top of the 13 Marines killed on 'his watch' in August 2021 in Kabul, then several Americans killed on 7 October, 2023 and then more Americans killed as hostages in Gaza. Republicans are not going to miss any opportunity for electoral gains!! That's how American politics work in a system where just a couple of percentage points would decide who'd be the next President, who'd control the Congress, and where would hundreds of billions of dollar flow due to the next govt's policies.