Actually, after LBJ declared his "War on Poverty" and opened the SS "lockbox" (LOL!), most thinking Baby Boomers knew that was never going to happen.
We still know that we are going to get screwed by the government on our SS benes.
All tied up in LBJ's demand for self-glorification and renown, and in the opening of the Vietnamese War.
LBJ's "Guns + Butter" (the "butter" was his domestic self-monumental legislation) choice led him to open the SS "lockbox" to help fund the deficits he was running.
He was afraid that the Republicans would be able to force him to choose between funding the war and funding his monuments, so he broke the lock and ran deficits, and then sent McNamara back to Congress to demand deficit appropriations in the name of "troops in the field" -- deficits then amounting to about 12% of the budget, if I recall.