Christian Post reports that during the Q&A at Ligonier's 2017 conference, MacArthur answered this question: is it sinful for a Christian to make a product for a same-sex wedding?
Rom 3:6 May it never be! For otherwise, how will God judge the world?
Rom 3:7 But if through my lie the truth of God abounded to His glory, why am I also still being judged as a sinner?
Rom 3:8 And why not say (as we are slanderously reported and as some claim that we say), "Let us do evil that good may come"? Their condemnation is just.
1Th 5:22 Abstain from every form of evil.