I'm so happy you think our constitution is 2 words long consisting entirely of something the government is allowed to do to its people. Which, when extrapolated, is pretty much anything and everything.
That is indeed the danger of the progressive view of unlimited government power through a "living Constitution" and "promoting general welfare." The government could literally control every facet of our lives under the guise of promoting the general welfare.
As an example:
"We can't drive our SUVs and eat as much as we want and keep our homes on, you know, 72 degrees at all times and -- whether we're living in the desert or we're living in the tundra, and then just expect that every other country is going to say, okay, you know you guys go ahead and keep on using 25% of the world's energy, even though you only account for 3% of the population, and we'll -- we'll be fine, don't worry about us. That's not leadership."
- Barack Hussein Obama
Government directly controlling what we drive, how much we eat, and the temperature of our homes is our future, I fear.