So I can't force other people myself, but I still am a (potential) accomplice in a completely different kind of "forcing other people" stuff because I didn't explicitly prohibited others from doing it. I... understand this argument, thank you.

P.S. "Carefully granted"? The words "to deal in the Software without restriction, including without limitation the rights to [rather long list of verbs]" is anything but "carefully granted", it's a blanket permission.

And yet including the additional restriction "this software may not be used to enslave people" makes the software no longer "free". It's odd how often slavery is mentioned in examples about how free copyleft software is, while the first of the so called four freedoms insists that using software to literally enslave people is a freedom that must be protected.