There is also a different point here: Even with 100% knowledge¹ that Open Borders is the right policy, implementing it overnight can be a disaster, since insti

There is also a different point here: Even with 100% knowledge¹ that Open Borders is the right policy, implementing it overnight can be a disaster, since institutions, culture, public opinion etc need time to adjust to the new reality. ¹ For the sake of argument. Let's not debate immigration policy.