There is no such thing as objectively illegal.

Given the first amendment and the supreme courts stance on originalism one could make a compelling argument that this type of speech is legal. As an example. One could further point to any example of the current administration or the police or examine historical injustice codified into law. Or, just look at Israeli actions.

Laws are enforced by power. And are dictated by societal pressure. They are not objective in the slightest. There’s an entire profession dedicated to the subjectivity of laws.