I find it amusing that although this card is called "Self-destruct," it will probably most-often be used more like an escape pod. Director Haas, Chairman Hiro, The Board, and whatever card completes the cycle when NBN gets a big box... they will all love using this card as a safety net to make sure they're never trashed while being accessed. The fact that it might also do some net damage is just a bonus.
I guess if you think of trashing the server as literally just destroying the data (which is what it really is), it makes sense that all the top executives will make sure they can quickly wipe their sensitive data in case of an intrusion. Director Haas is never going to let you have access to her personnel file, even if it means destroying it to keep you away.