Israel has amassed such an arsenal, it can continue this shit on it's own for a good while. An arms embargo would still be appropriate though

No way. First they can't use some of those weapons without US approval. They're made that way. Second, if they were running a more normal terror campaign (like shock and awe for example) that'd be correct, but they're not. They're carpet bombing Gaza and Lebanon using "precision" airstrikes. It's an incredibly wasteful method of genocide that only has the advantage of being able to say "but we're targeting terrorists". No way they can keep up this nonsense without unlimited US weapons. Third, Israel would be eaten alive by its neighbors without US diplomatic (or "diplomatic") support. Do you understand how much support any middle eastern leader would get by sayint "We'll go fight Israel to save our Palestinian brothers"? The only reason it's not happening and even Iran is leaving the job to its militias is because of the US carrot and stick.