Antisemites have always believed this. This isn't new. The people who claimed Jews were intent on slaughtering non-Jewish children because they saw them as sub-human did also believe that wholeheartedly. It wasn't just a ruse.
Everyone rational has always believed this. The government of Israel is not the Jewish people any more than the government of ISIS was representative of Muslims.
Are you claiming that the Jewish governing party, made up of Jewish individuals, in the Jewish State (Israel) are incapable of holding back their bloodlust to slaughter non-Jewish children on the basis that they see them as lesser than Jewish children?
Take a moment. Think about it. Because we both know that this is in fact what you have been claiming. And maybe you want to walk that back, and self-reflect, and think whether maybe you've gone wrong at some point in your justifiable attempt to seek justice for oppressed peoples.
At the point they're publicly calling those kids names while bombing them... Yes it's pretty clear they believe Palestinians are subhuman. And if that's blood libel then so is saying Hitler believed Jews to be sub human
You cannot have it both ways. You cannot commit genocide and tell the world they're the racists because they called you out.