Maybe you are misunderstanding. A single cop deciding "okay today I'm letting you off with a warning" is quite different from the President directing the entire Federal bureaucracy to not enforce existing immigration law. If for some reason a large jurisdiction, say maybe the state of California, decided that it was policy to let everyone off with a warning for speeding infractions, then, if I squint hard enough and ignore a wide range of second and third order effects, then yeah maybe they are similar.