Eeven if the dispatcher is a LEO, his telephone advice does not deprive a citizen of the statutory right to defend the property of others. The “value judgment” of the dispatcher (essentially, “property isn’t worth shooting someone over”) is not the value judgment in Texas law. Moreover, the dispatcher’s judgment reflects the kind of liberalism that has resulted in rampant crime. Assuming that these were thieves, they undoubtedly would have continued victimizing others and probably had, or would, commit crimes against persons.
Sometimes it's best to keep your nose out of the police followup when you've reported an ongoing crime.
They'll know their own.