Just lousy reading comprehension.
Provide also applies to the general welfare.
No it doesn't. Notice the comma separating the phrases "provide for the common defense" and "promote the general welfare"
Go back to 5th grade and learn some grammar. I'm sure your Mama will make you PB&J with the crusts cut off and hold your hand at the bus stop
We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.