The first is that we don’t have any sort of defensive weapons between Israel and Gaza. To intercept missiles/bombs/whatever
Stuff like the Phalanx and RIM-116 at sea; or C-RAM (technically it’s the “land based phalanx system”…. But there are some critical difference in radar and the munitions it uses.
The second answer is that the US navy hasn’t been ordered to. They haven’t been ordered to because their civilian leadership is 100% okay with Israel bombing the fuck out of Gaza. Yes, that includes Biden.
Politics. US is ally with Israel but notxwith Iran, US isn't the world police but a country defending their interests which includes their allies.
I somehow hope, that this slow drone attack is also some political theatre like, we shoot some drones to protest our embassy bombing, but we won't go further
US politicians are unfortunate hostages to their bigger sponsors / financiers. Most of the players on both sides of the US political spectrum have been funded by israeli or pro-israeli contributors. We call Israel an ally, and that's a nice coat of shiny paint to hide the Stockholm syndrome.
In addition to the other answers you’ve received, it appears there was a period of sever al hours between the drone launches and them arriving at Israel. There are probably seconds between launch and impact on Gaza
Minutes, not seconds. I used to be a counter ballistics radar operator. You can track a mortar, rocket, or artillery round in about 20 seconds from launch. It takes about a minute to send rounds back to the source. About 30 seconds to a minute after that the initial rounds will land. A minute after that the counter battery will land and destroy anything at the launch site.
The wrong assumption you're making is that Israel is blowing up hospitals.
You're probably thinking about the blast in Al-Ahli Hospital in October, that was ruled by both the US and most news agencies as a failed Islamic Jihad launch.
The justification is that there targeting Hamas and that Hamas is using every hospital, school, mosque and other typical safe-haven as bases of operations.
Two volunteer doctors working with Doctors Without Borders were killed by a direct hit from an Israeli airstrike on Al Awda hospital back in November, so that's at least one example.
Oh ho ho, you innocent child you. Sit down and allow me to tell you a story. It starts many decades ago and involves a Prince, some angry free thinkers, JFK, Anna Nicole Smith, and a smaaaaall aubergine 🍆.