The First Amendment to the U.S. Constitution protects, among other things, the right to peaceably assemble, and the right to petition the Government for the redress of grievances. Being able to get together and ask for the Government to do something is core to the American identity; and it protects the rights of Black Lives Matter supporters as much as it protects the rights of a company to request laws be enacted or changed.

(Disclaimer: I work for AWS but my opinion is my own and does not necessarily reflect the views of my employer.)