"And if you use the comments section on posts like this to b---- and moan about America please understand there are countries in the world where criticizing your government will get you killed or imprisoned," he added. "Criticism is a right and necessity in amending the flawed systems of man. So by all means, let your voice be heard. But never forget your right to free expression is paid for in blood. May God give their souls rest, and may they live in our memories this weekend and always."