No, they could harm “only those people who do not have the seal of God on their foreheads.” The Lord makes a distinction within the human race on the basis of his claim upon specific persons. This is what God did during the last seven plagues that fell upon Egypt too (see Exodus 8:22–23).
4 They were told not to harm the grass of the earth or any green plant or any tree, but only those people who do not have the seal of God on their foreheads.