Adams pointed out that there are lots of bad things that happen around the world. Brutal dictatorships. Tyranny. Civil wars. Revolutions. Wars between nations. Poverty. Famines.
Notwithstanding the death and destruction such "monsters" produced in foreign countries, however, the U.S. government would not go abroad to slay them. That was the founding foreign policy of the United States, a policy of nonintervention.
That's not to say that the United States was unwilling to offer any assistance to people who were suffering in foreign lands. Private Americans were free to offer their support, either personally or with financial donations. Equally important, the United States had a founding immigration policy of open borders, which meant that anyone who was willing and able to escape the monstrous conditions in his homeland and emigrate to the United States was assured that he would never be forcibly repatriated to his country.