Per #1278360: Rules still tries to execute input evaluators after the providing module is uninstalled, if people customize AL's default Rules or create their own, and they don't delete them before AL is disabled/uninstalled, they'll get errors when those Rules try to run because the AL action and input evaluator won't exist any more. klausi (a Rules maintainer) suggests that it's too hard to remove the Rules (actions) in code. I've proved "too hard" irrelevant just by the fact that this module exists, but still, Rules takes the approach that it's site administrators' responsibility to maintain their Rules and understand the consequences of disabling modules, so maybe we should take the easy route and just warn people that there is a possibility they'll get errors and what to do about it when the module is disabled.