In that case i'd say the rule needs to be updated then to mention that jokes about any of those things is also not allowed since that is not specified anywhere in the rules and, just my 2cents, at the moment it seems like it's being applied unfairly as the previous comments look to be breaking rule 2 (main comment is promoting the idea and the second is endorsing it).
When you are talking about actually providing the means to do it, you're crossing that line.
In that case i'd say the rule needs to be updated then to mention that jokes about any of those things is also not allowed since that is not specified anywhere in the rules and, just my 2cents, at the moment it seems like it's being applied unfairly as the previous comments look to be breaking rule 2 (main comment is promoting the idea and the second is endorsing it).