Its called trust! Clearly, the club members have embraced the range safety protocols and have no issue in complying.
I think that sometimes, certain individuals insist on going beyond what is deemed safe. They will tell you that we cannot have too much safety. As a (now retired) Safety Manager of 25 years plus experience, I can tell you it is both perfectly possible and highly undesirable to have 'too much safety' in place. Different ranges / situations may require different and more complex safety rules ... and that's fine, but every time 'someone' thinks that it would be a good idea to add another ingredient to the safety 'pot' ... it detracts from the original taste and may make a once perfectly acceptable recipe inedible. If someone really believes that additional controls are necessary, let them compile a risk assessment to justify that risk on paper.
Bolt fully back or removed, magazine removed and chamber flag inserted with muzzle ALWAYS pointed in a safe direction is safe (Period).
A firearm in a bag or covered is an unknown quantity (Period).
All firearms to be physically cleared at end of detail before bagging. (NO exceptions)
Firearm safety is not difficult. Don't complicate the issue by adding steps that fail to bring value. As shooters, we have enough of that nonsense to deal with as it is.
Jamsie