How does Israel keep getting away with it

Not even asking in an antisemitic way, but they've straight up remorselessly murdered like dozens of Americans over the past few decades. Between USS Liberty, that woman who got bulldozed, and now this aid convoy whose founder received a medal from Obama or whatever. Is it really not a red line for support? I get that Americans aren't gonna give a fuck about Palestinian children or whatever but surely at some point murdering Americans would be a sticking point