The issue regarding privateers had nothing to do with the People's right to keep and bear arms. The Congress granted letters of marque to ships of the line that could be used in times of National crises. We have the classic Apple vs. Orange line up with this.
Pay special attention to post #29
You don't understand the use of letters of marque at all. They were used by many countries, not just ours. Armed merchant men were common at the time. It absolutely has bearing since armed merchant ships existed prior to the issuance of a letter of marque. A letter of marque was not a permit to arm a ship. It was a hunting license.
See post 10?
"In fact, the reason the FedGov hired so many privateers was BECAUSE they were ***already*** armed."
So why didn't they disarm (or perhaps, disordnance?) these men prior to any extracurricular service if only small arms are included in the 2ndA?