The only real answer is to keep the public well away from HLSs when they are in operation.
Douglas Adams got to the bottom of this problem when, in 'The Hitchhiker's Guide to the Galaxy' he defined the SEP Field. It's 'Somebody Else's Problem'.
It's about responsibility. Even though the helicopter has been routinely used as a tool for saving lives for over 70 years, in all that time, nobody has taken responsibility for where we land them. DfT, DHSC, local government, emergency services, and hospital management, usually show not a shred of concern about where this is going to happen. All looking the other way, until the SEP field becomes so powerful that there is a charity building helipads all over the place that appears to let them all off the hook.
I see you, you shirkers. I see you.
