It's a "you scratch my back, I scratch yours" type scenario. Of course the Israeli government will not speak against these entities--any more than the U.S. government will speak against Jesse Jackson's Rainbow Coalition or ACORN. They serve their purposes. The fact that other Israeli parties do this sort of thing doesn't mean anything. Parties that claim to be religious and speak for G-d should be held to a higher standard.
Specifically, the Charedi parties are tolerated and supported because they side with the Israeli government every time and get their followers behind Israeli government decisions, i.e. what Aryeh Deri and Rabbi Ovadia Yosef did in regards to Oslo. I don't think this is a complicated concept. See Av Nammer's comment towards the end of this piece.
The only Charedi party right now that looks like a genuine voice of reform is Rabbi Amnon Yitzhak's.