No, it was your opinion. You believe the man would have been punished by cops for saving a cop.
That is likely accurate and I agree with you.
Further, I object to cops who have no common sense. They are deserving of condemnation.

(a) No, what constitutes an affirmative defense under Indiana criminal law and who bears the burden of proof is not my opinion,
(b) No, the fact that he confessed to having broken the law regarding possession of a firearm by a convicted felon is not my opinion, it's a matter of fact
(c) No, it's not my opinion that law enforcement officers would choose whether or not to enforce the law - one hopes that they do not make that decision themselves when confronted with a clear case of a violation accompanied by a confession - that is the job of the prosecutor and the courts, not the officers on the scene
(d) The only opinion being expressed here is yours, to wit: "I object to cops who have no common sense. They are deserving of condemnation." That is a statement of personal subjective belief and opinion.