Up till very recently in historical terms, the courts in the US defined public decency fairly restrictively and they were aware of the First Amendment. Direct non-argumentative blasphemy would not be tolerated.
Why hooliganism is a peculiar trait of atheist is explained in my first port here, #76
an atheist monument is absence of a monument. An atheist bumper sticker is absence of a bumper sticker. Since that is not satisfying to some atheists, instead of proclaiming their atheism they need to vandalize my monuments or insult my religion.
I take it, then, that you are in favor of blasphemy laws?