The Draft sparked protests that involved burning the American flag.

I think in WW2 what sparked love of the country was being in the trenches and fighting against other well-equipped armies. Japan and Germany were serious enemies that could only be overcome through the deepest coordination between fellow soldiers, which by necessity meant love.

The Viet Cong were guerrillas striking without clear battle lines, using women and children as bomb carriers. They didn’t threaten our homeland.

Being drafted to fight in Vietnam was enough to spark protests that involved burning the American flag, and civilian massacres in the US.