Why is it OK for the Palins to slam Levi yet he cannot do the same back?

Bristol Palin’s baby daddy has only seen their two-year-old son Tripp ‘a handful of times’ in the past year, according to sources close to Alaska’s former first family.

As Levi Johnston, 21, prepares to release his expose, Deer In The Headlights: My Life In Sarah Palin’s Crosshairs in September — the Palin family are begging him to end his attacks on the ex-Governor and be a proper dad.
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Sarah Palin has a Serpants Heart