If you oppose minimal, sensible parental controls, you open the door to whatever someone can jam down our throats that also happens to implement parental controls as a side effect.

If you oppose the law to force liquor stores to deny service to minors, but people are still upset about minors getting alcohol, you have no right to be surprised when the next proposal is to ban alcohol for everyone, and you have no right to be surprised if it passes.

Worse, they are making society less free for their children - the parents themselves will be either dead or too old to care by the time the consequences are in full swing.