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I mean, when I said "Under your logic...," I'm just extending your argument in the obvious way...Extending my comments to the point that I am allegedly suggesting disregarding private property laws egregiously to erect a sign at your private, personal residence and then call that constitutionally protected free speech is the obvious way?!
We have very different notions of obvious, friend. Your last sentence read as having very little to do with extending my argument in a way that would be obvious to other sensible citizens and, instead, extending it in a way that distorted its meaning entirely to shoe-horn it back into your preferred view of seeing protecting free speech in the public sphere as something that ought to be beholden to a others' definition of whether or not they approve of the message, allowing for legal punishment and incarceration for sharing one's views in a public way.
Can someone put a sign up on your house and it be constitutionally protected free speech? Nope. Can persons stand peaceably outside your house with a sign airing their grievances? Yep, absolutely. Can they write on the sidewalk or street in chalk to get your attention? I'm willing to bet they can, so long as they are not inciting violence or threatening you. You don't own the street or sidewalk. It is public space. And if you are going to abuse the justice system to apprehend and punish them, well, at least you're sticking to your principles. But I hope also that you call the authorities on any children in the neighborhood who might also be writing in chalk on the street. Or any businesses that might so abuse the public space as to write on sidewalks with chalk to grab the attention of consumers.
You called for jail time and a fine for writing in chalk on a sidewalk. You called it graffiti and vandalism. There was no destruction of public property. There was no private property damage, to my knowledge.
You further suggested that there ought to be some kind of litmus test for who deserves First Amendment protections. Thankfully, the founders were wiser than you and did not make our right to speak freely dependent upon passing a test that evaluates our entitlement to constitutional rights beyond that of being a citizen.