They have always been emboldened.
They didn't steal "secrets", but they almost certainly were covertly supplied with US nuclear material with the tacit approval of the CIA.
As for the claim about killing US sailors, here's GDF's vid on the attack against the USS Liberty: https://www.youtube.com/watch?v=CfABflKvFzk
Gaza happened under Biden's watch, and continued under Trump.
This is the first time the lie has worked to this extent.
Death to America is a great motto, but that's all it really is, they sadly lack the capability to follow through with it. With or without these latest strikes.
Maybe Harris wouldn't have gone this far, but the democrats were happy to carry water for Israel for a long time.
I'd argue their unflinching support was also a key to priming the American public for this moment.
Fully and unquestioningly supporting whatever Israel does is practically a requirement for all American politicians.
There no evidence to support that. US policy has been to fully support Isreal, full stop. At least under Biden there was talk of suspending arms supplies due to Gaza, Trump just wants a shot at that beach front real estate. Not comparable at all.