"Affiliations of petitioner", is intended to simply mean that if you are a gangbanging thug, or are a known crack-head, or are a raging alcoholic, or are associated with Mexican drug cartels, for example, then you will very likely be denied the right to “pack heat” while in public. Essentially all it really means (in boiling it all down) is that through your own prior contacts with state-by-state law enforcement, etc. you must be shown to be a responsible citizen with at least a fairly clean background to exercise this right in public. It is by no means intended to restrict gun ownership or prevent anybody from defending themselves (e.g., with exception to a few states here and there, if you wanted to you could carry a gun with you almost anyplace so long as it remains unloaded inside of a locked container that is kept inside of a bag or automobile), but only to hem and secure reasonableness on the subject of conceal carry and open carry at the national level.
As to the gun safety course, it is simply designed to ensure that you are familiarized with state and federal gun laws and on how to handle yourself during confrontations when armed with a firearm, how to take proper safety precautions when taking aim and firing, your resulting civil responsibly, etc.; and most importantly you must show the course instructor that you actually known how to load, unload, clear, fire, clean, and stow your firearm. I have personally taken one a few years back (at a local gun range for just $70) and found it to be highly enlightening, and well worth the time.