Though I am no fan of Sharpton and I detest Jackson, I think your comparison is a little off-point.
I think Sharpton would argue that he marches precisely because the alleged victim is a marginalized person without advocate.
In contrast, I pity the fool who attacks Chelsea Clinton. And, indeed, Shuster was a fool who let his rabid hatred for Hillary cloud his judgment, comparing Chelsea to a prostitute for doing what practically every adult child of a politician running for office does! And the result? He has been suspended. Chelsea Clinton needs no Al Sharpton, that's for sure!