They say, "this should be taught in school," because they're too lazy, or stupid, to teach it to their own children at home. They have many, many excuses for not doing it themselves, that all boil down to, them not wanting to be bothered being parents. Sex ed is one example. Morals, ethics, and conscience are 3 more. <--- Is this because they themselves have none of these? They are severely lacking in the majority of people, IMO. i.e. Do something wrong and blame someone else or deny knowledge. Edited to add ethics and wording accordingly.