SNIP It is true that the Bill Of Rights was introduced by a federalist (James Madison) but it was done to help ease some of the concerns raised by the Anti-federalists.
Well, since ETF is being polite, I'll take the hard-hitting approach.
Madison drafted the Bill of Rights for one of two reasons that I'll explain in a minute. Neither of the reasons were because he wanted them. During the ratification period when the state's were considering the constitution, the anti-Federalists and like-minded people were raising a stink, or point it out. It threatened to derail ratification.
The Federalists argued against a Bill of Rights. One argument was that since the government had limited powers, there was no need for a Bill of Rights. Yeah, right. We have a Bill of Rights, and look how we are treated by the fedgov's three branches. Even with a Bill of Rights, the Federalists gave us the Alien and Sedition Acts. No need for a Bill of Rights they said during the ratification period. Yeah, hang onto that dream. Those men were nowhere near that stupid as to not know how politics is played.
Madison is on record as considering the Bill of Rights, "this odious business".
Oh, don't forget that Madison was one of the authors of the
Federalist Papers. (Why call them "papers"? Why not just call them what they were: "letters" to the editor? "Papers" sounds so much more important, doesn't it. Much more credible.)
So, with all the racket from the anti-Federalists about the problems with the constitution, Madison figured he had to do something. I am of the opinion that he wrote the Bill of Rights for one of two reasons:
1) He figured it would shut up enough anti-Federalists that ratification would proceed.
2) He foresaw that by giving a Bill of Rights, the dumber resisters would be satisfied, and the senior anti-Federalists would be undermined in their remaining arguments against the constitution. (This is what actually occurred. The lack of a Bill of Rights was the main talking point to rally the population. There were/are even bigger problems with the constition. These problems were of even greater concern to the senior anti-Federalists. But, when Madison got the Bill of Rights put through, enough of the simpler-minded were satisfied that the constitution then went through, otherwise unchanged. Meaning the other changes desired by anti-Federalists never occurred. Writing the Bill of Rights totally undermined and nullified the anti-Federalists and their other, bigger concerns.) Meaning, Madison deftly undercut real changes in the constitution that he preferred to avoid.
So, much for the guy we were all taught to revere as "The Father of the Bill of Rights"--James Madison. The real fathers of the Bill of Rights are Patrick Henry, George Mason, and a few others who did the demanding that finally pushed a resistant Madison into asking the states to submit lists of proposed rights from which he culled the Bill of Rights.