Just because a length of rope can be used for strangling someone, that doesn't mean that the rope manufacturer should be held liable. Just because you can break someone's skull with a hammer, that doesn't mean the manufacturer can be held responsible.
However if the RFQ comes in from the "Ministry for hanging and bashing skulls with rocks" you would be well aware of what the potential use will be. But I take your point, and agree with it only as long as the company supplying the equipment has a reasonable expectation that the equipment will be used in a non harmful manner and haven't turned a blind eye to other uses.
If it is proven that certain companies, who only exist because of our Western culture and governance systems, supplied equipment which they knew would be used for the purposes of torturing or killing people by a despotic regime, I hope there can be some sanction.