People support lots of ideas. I support the idea of everyone getting 1 billion dollars.

Can we do that ethically? No. Of course not. The implementation must necessarily require death and theft.

Age verification is a similar problem. I support the idea of minors not accessing bad data. Okay, cool.

Is there an ethical way to implement that? No, of course not. It would require extreme surveillance and said surveillance would necessarily be used for evil.

I mean, imagine this. New law: children can never smoke law. Great! 100% support! Now you must upload a video of you smoking every time you smoke so the government knows a child isn't smoking. Uh... Not great, very bad.

Its all about how you ask the question: "do you support children never smoking" => 100% support. "Do you support requiring video uploads to the government of every time you smoke" => 0% support.

We're actually asking the same question, it's just a matter of how favorably we show the issue.