That may be why he is doing it, but that is not what his argument is. He is making a fairly robust defense of IHL, accusing Israel of war crimes, and asking for it to be treated like any other country. He also thinks we should not support them militarily, remain neutral, etc.
Importantly, he is being effective at persuading large parts of the right that what is happening in Israel is wrong. As long as Israel is a wedge issue for Dems and unites Republicans it just is extremely difficult to make progress. There needs to be opposition from the right.
Liberal activists who want to make progress should be preparing to primary Dems who support Israel. There is every indication that Trump and Netanyahu will keep this going, and try to force Gazan’s into concentration camps. The politics are shifting in favor of justice and we need to prepare.