On this we fully agree, but to contend that the bishops do not have a right to speak simply because someone does not like what they are saying is absurd.
The bishops' pastoral authority properly involves faith and morals. The "speaking" (or "issuing of statements") which does not strictly constitute doctrine, however, should come wih a disclaimer along these lines:
"As Bishops we teach authoritatively on matters of the moral doctrine of the Church: the things which involve sins of omission or commission. These policy recommendations involve a choice between competing goods. You can disagree with our prudential judgments without sinning. Our political opinions do not have canonical authority."
"Thank you for listening."