God, please use an ounce of independent thought and don't just internalize the first thing you read.
Americans were killed in this attack, and the US gives Israel absolute support. There is absolutely zero need to fish for an excuse to attack Gaza.
It's probably to send a signal to Iran to not get any ideas of getting further involved and lend some support to Israel. Not everything has to be a conspiracy.
The idea of this being some sort of trap/tripwire for Hamas is bizarre. It's pretty damn easy to not fire on US warships, and doing so might be the biggest strategic blunder you could make
Regardless it's also a hotbed of conflict that could easily start spiraling into the rest of the region. A carrier group just offshore can keep an eye on the situation and make sure Iran doesn't get any crazy ideas