Nobody in the cartoon above is being fired upon.

Also, South Park's depiction of Cartman as antisemitic is often interpreted as poking fun at antisemites.

While some in the Jewish community have praised the show's depiction of the character Eric Cartman holding an anti-Semitic attitude towards fellow student Kyle Broflovski as a means of accurately portraying what it is like for a young Jew to have to endure bigotry as an ethnic minority,[34] other Jews have blamed South Park and Cartman for having found themselves surrounded by "acceptable racism".[35]

http://en.wikipedia.org/wiki/South_Park_controversies

No idea how you got the idea that Matt Stone getting shot at is necessary for this cartoon to make sense.