You forgot to mention to begin, support and continue a welfare state/safety net, one needs to make (economic) slaves of others.
IOW: They made slavery of SOME illegal to make slaves of us ALL.
That is because it is not necessary. There always will be people who cannot take care of themselves.
IOW: They made slavery of SOME illegal to make slaves of us ALL.
That was the point.
Instead of a war, people who didn't want slavery should have ponied up and bought their freedom. In an act of covetousness to take the property of others, they became property themselves. That is why the Tenth Commandment is there.