In well designed cryptographic security systems, the attacker needs to do exponentially more work than the defender in order to read a secret, forge a message, etc., subject to appropriate hardness assumptions. Maybe this is true for many non-computer security-ish systems as well, like choosing good representatives in a voting system or avoiding overpaying for advertised merchandise, and we simply haven’t reached the level of intelligence as defenders for the exponential effort of attackers to be prohibitive.