NAFTA was signed by Clinton, but it was GHW Bush who originally spearheaded the effort, I believe. (It may be a holdover from RR's tenure.) I'm not sure what the Kyoto Accord has to do with the CPSIA or our freedom; the US signed it, but it hasn't been ratified (we're the only country to do that.)
I think Congress (doesn't really matter who's in the majority), feels the need to justify their salaries by DOING something... anything... Whether needed or not. Good governance should not be solely about action after the fact or just for the sake of action.
Of course, in the case of the CPSIA, they just threw a blanket over several industries and treated them the same, because of a few incidents (equalling thousands of toys), rather than punish the actual facilities and companies.