A solution may be to provide a template, where developers can list explicitly the activities they do not support. You'd still be imposing your morals and belief

A solution may be to provide a template, where developers can list explicitly the activities they do not support. You'd still be imposing your morals and beliefs on others, but at least it could be less ambiguous. This would not be a "free software license" due to the nature of the restrictions, so it would never make it into a distro like Debian for example, but maybe you don't care about that. EDIT: For this to really work you'd probably have to encourage users of the license to be very explicit and give some examples which don't suffer from the slippery-slope problem.