The big time lobbyists, corporate money, the political machine, call it what you will controls organizations ranging from the NAACP to Planned Parenthood to make them subsidiaries of the Democrats and groups like the NRA and National Right To Life to make them subsidiaries of the Republicans.
Any “principles” that the groups may have originally stood for are subordinated to loyalty to the political machines of the major parties.
The NRA has very bad political taste and with this McConnell support I can clearly see the organization as a very narrow societal organization.