This can only be true if you believe in a certain mad-scientist version of these things. We as a society have systems (however flawed) to hold scientists and engineers to ethical standards: e.g. peer review and in many cases--e.g. civil engineering, architecture, medicine--even legal frameworks to enforce ethical standards. Science and engineering are human endeavors, they are not divorced from the human condition, they cannot be separated from humanity and human rights.

Maybe you mean mathematics is amoral and are committing the common conflation of "engineering is just applied science and science is just applied mathematics," which is a really bad case of missing the forest for the trees.