[JoshTriplett]

"If we don't sell to XYZ someone else will" is not an argument to keep selling to XYZ, unless you already agree with (or are indifferent to) XYZ and their activities.

"XYZ is doing bad things but it'd be even worse if they did bad things less efficiently" is not an argument to keep selling to XYZ, unless you already agree with (or are indifferent to) XYZ and their activities.

Making an organization less efficient, or otherwise slowing an organization down, is not going to single-handedly stop it, but that doesn't make it pointless or counterproductive.

For the concrete example here, you haven't provided evidence that "less efficient" or "slower" applies only (or disproportionately) to activities that stop hurting people rather than activities that hurt people.

Also, you've created a false dichotomy, dismissing the existence of people who agree with portions of a branch of law but disagree with how that law is enforced.