Perhaps the authors of the poster have been over-influenced by American media. Australians typically believe we all have guns and there is rampant violence EVERYWHERE. These folks may have been unduly influenced by "Old Yeller" and "Cujo".
Or, it could have been produced by a company that manufactures vaccines.
I am willing to share my rabies safety tips to anyone traveling to the US who wishes to avoid the 3 vaccine series. Do not approach wildlife - especially any that seem "friendly" or very, very "unfriendly".
And, you best not share needles or have sex with them either.
There. That should do it.