Bad argument. "All taxation is theft" is an opinion. "Tax returns can be automated" (either 100% or to some lesser degree) is a provable or disprovable matter of facts.

I would tend to agree that it's a provable fact that tax preparation can be automated (not 100%, but enough to be worthwhile and time- and money-saving). Someone who states otherwise is likely to have some ulterior motive for saying so, likely a corrupt one.