Sorry, I didn't realise that if you had a high level of passenger numbers then proper security was less important.
What I said had nothing to do with the importance of passenger security - and I think you know it didn't.
Safety and security are, at best, idealistic concepts. In the real world, they have to be balanced against the ability of the transport system to function reasonably. Passengers held up in a queue they deem unnecessary will suddenly develop a much higher tolerance to risks.
Some bright spark recently suggested airport-style security on the London Underground rail network. With 3 million passengers per day? You'd have a revolt before you even began.
It's not that passenger security isn't important. But if it costs too much in terms of convenience, you can bet your passengers will throw the dice and take their chances elsewhere.