The trip means that Biden is clearly associating himself with whatever the Israelis do next. The political advantages–both internationally and domestically–of that will only outweigh the disadvantages if Biden already has a clear agreement with the Israelis on freeing hostages, providing lots of humanitarian aid, and getting Americans and other foreign nationals out of Gaza.
If the Israelis, as they often do, ignore our advice and bounce the rubble, this is going to be a terrible mistake.