Do you have the proof that these people were "illegal" or are you speculating? Who decides whether they're "illegal" the courts or executive? Who sets bond and who decides who gets detained without bond?
Of course I have no proof. All I'm saying is that the government has a history of catch and release of ILLEGAL immigrants. I know that from someone who works for ICE and formerly with the INS.
I don't trust either Bush or the Congress on this issue, for good reason.