Your premise that Season 2 was "full of torture scenes" (it was nothing compared to Season 4) is false. And anyway, the producers of shows like this (i.e. those with messaging deemed advantageously pro-establishment) are rewarded by said establishment by being connected in and obtain insider information.
I don't know whether Season 2 or Season 4 had more torture scenes, but there were enough in Season 2 (see: http://24.wikia.com/wiki/Interrogation) to make it unlikely that the show's general use of torture was not caused by any sort of information leaked by the "establishment." It simply predates the Bush torture program.
I'm not sure what point you're trying to make. Are you saying that the producers were rewarded after the fact, for the pro-torture message? And that encouraged them to make Season 4 even more torture filled? What sort of "insider information" did they get?
