I was under the impression that parental control isn't actually a separate app, but something built into the UI, since it's actually located in the settings not the apps. In any case if there is something you don't need to use, don't use it. It is not active unless/until you set it up.
Yes, some Samsung apps are built into the UI, so removing them would cause UI problems, errors, and glitches, thus, Samsung does not allow them to uninstalled so as to ensure the best user experience possible.
