The Congress started forgetting the day after ratification, whenthe squabbling, jockeying for power and influence, etc. started.
Certain people in Congress have always been willing to push for as much as they could get away with; and some of these people have been very shrewd at estimating how much they could get away with.
The very existence of the Bill of Rights is the biggest sign that gov't WILL try to take more power and infringe rights. If gov't was knownto be safe, there would be no reason for a Bill of Rights.
I'm convinced it has been and will continue to be an on-going fight to beat the Congress back within its constitutional boundaries.