No the boiling frog isn't about intelligence at all. It's about phasing. Everybody knows what's going on and had you explained it to somebody before the turn of the century, saying "Here is a list of the freedoms the government will take away soon", they would've been outraged. But it's been phased in. And every phase has been backed up with arguments. Every phase has seen discussions, nation-wide debates and were usually initially received with scepticism.
But here we are. The police are allowed to hold us in captivity for a virtually unlimited amount of time so long as they stamp "potential terrorist" on our foreheads, we can't travel without having our underwear turned inside out and our personal details wired in to the government of the nation we're headed for and if the security services, just for funsies, feel they need some information on you, they can get it in the blink of an eye.
Intelligence has nothing to do with it. Marketing plans and phasing are the key words.