Torrey Pines is not a question of safety or airspace — it’s a question of municipal policy choices.
Torrey Pines: the issue is monopoly, not flyingAt Torrey Pines, the facts are clearer — and that clarity is what allows policy critique, not speculation.
What San Diego chose to do 
Treat the gliderport as a concession

Award exclusive operating rights

Permit a for-profit monopoly

Back that monopoly with police enforcement
That’s a policy choice, not a necessity.Comparison to other coastal activities is spot-onCities routinely allow side-by-side use where: 
Businesses operate

Public recreation remains free

Safety rules apply equally
Examples cited are excellent: 
Surfing

Kiteboarding

Sailing

Boating

Tennis courts

Even ski resorts (mixed free / commercial zones)
In all of those: 
Businesses charge for
servicesNot for existenceThe public is not excluded from the activity itselfTorrey Pines is an outlier.NOT SOMETHING GOOD FOR SAN DIEGO CITY ....
So, San Diego, wake up and policy right!