>The same thing can be said of many adults, but this is not a crime.
This is purely a result of legalism, not morality. At some point the government needs to stop caring about people's sex lives. Instead of viewing age of consent as the magical age when people are suddenly responsible enough to have sex on their own, it should rather be seen as the age the government decides to stop protecting you from sex, regardless of how naive or manipulable you may still be.