Why are holodecks still allowed on starships and space stations?

[Timo]

On the other hand, the ship could always safely be crewed by people subjected to the immunizing agents identified by McCoy - and she would have a heck of an intruder control system from that point on!

Timo Saloniemi

 

[Pavonis]

^ If the ship proved impossible to decontaminate, then it wouldn't have been "fine." And likely would have had to been destroyed.

Why wouldn't replacing the air on the ship suffice to decontaminate her?

 

[Gov Kodos]

^ If the ship proved impossible to decontaminate, then it wouldn't have been "fine." And likely would have had to been destroyed.

Why wouldn't replacing the air on the ship suffice to decontaminate her?

The ability of the contagion to survive in a vacuum, exposure to radiation and other ship wide decontamination methods is unknown. The danger it represents might be seen as too great to risk its surviving decontamination, or being transferred during decontamination.

 

[Therin of Andor]

Well, the USS Exeter wasn't really damaged. The entire crew was killed, but the ship itself was fine.

See the fanfilm series, "Starship Exeter".

If the ship proved impossible to decontaminate, then it wouldn't have been "fine." And likely would have had to been destroyed.

It survived.