It doesn't matter whether tyranny has malice behind it or an honest desire to protect the vulnerable. Tyranny is tyranny, and if you don't nip it in the bud, you'll have a hard time defeating it later.
In the UK and other liberal democracies, the children are becoming the government's excuse to take away freedoms and assert more control over the lives of its citizens. Tomorrow they may mandate video surveillance of every home that has children, to make sure they're not mistreated. Then they may mandate periodical physical and psychological exams of everyone who comes into contact with children, finally concluding that everybody may fall into that category. Then they may want to install monitoring on your body, to make sure you don't get sexually excited around children, because their safety comes first. And so on...
Nip it in the bud, better a little mayhem now than an Orvellian society later.