It comes down to what you favor more: free speech or property rights. Property rights? Then clearly any company can remove any content for any reason it sees fit.

If you favor free speech I would say plotting to kill the Vice President of the United States and ISIS recruitment aren't meaningfully different.

You understand that freedom of speech doesn't mean that private companies have to host or publish your speech, right? AWS is not Congress. They have no obligation to you, and you have no right to free speech on their platform.

>Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.

You cannot have free speech without property rights. It's an extension of it.

Who are terrorists? Foreigners the US government doesn't like? Who are domestic terrorists? Citizens the ruling faction doesn't like? Founding fathers must have been a bunch of terrorists.