I think BTS with the highest selling and touring power has the least crazy and aggressive fans at the airport. It’s started with the purple ribbon project which fans made as barrier for the boys to have safe passage in the airport back in 2018?2019? Plus we don’t encourage photos or videos that come from the boys private time. So that’s why BTS usually can go about their business abroad and in Korea without fans swarming them. The fans will share their experiences after the boys left. It’s really cool.
(Of course there will be some incidents but rare and not that bad considering their fame).
Dont know why OP is praising a behavior that is so disrespectful and dangerous. The Idols should not have to fear meeting with the fans. You do it better there.