Greg "Ghostcrawler" Street has stickied and locked a post on the official damage dealing forum to explain the dev team's design intent on totem-stomping macros. Basically, the team doesn't like the macros and is going to put an end to them.

"Blizzard does not like the gameplay of totem-stomping macros and we intend to stop it. Destroying a totem should be a viable strategy but it should be a choice and require some effort on the part of the destroyer. Making a macro to have your pet attack the totem without having to target the totem first does not in our minds constitute enough effort."

The technical change that is needed to break these macros has not been implemented yet, but the change will be announced when the team is sure it's going live.