So your argument against trains is that expansion can't be done without temporary closures and restrictions? Just like with any road project? The problems with cars are just as bad, detours and closures kead to traffic infarcts, and are at least as much of a hassle like transit replacement services.

Expanding airports can be better acommodated but is in many cases close to impossible. Having aviation carry the capacity of an HSR because national infrastructure is underdeveloped is a major issue and limits development.

If you leave your car in my country on the highway, without being involved directly in an accident or such, you have a good chance of losing your drivers license. Opening the windows in a car grilled by the sun, does no good either. Anyone can open the door in a standing train in case of emergency btw. If staff doesn't allow passanger evacuation in case of danger to passenger health, that is an issue with badly run train services. Tunnels have to have an evacuation plan, at least in decently run systems.