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That sounds like bad design on the developers' part. There are many unavoidable ways a program may be terminated unexpectedly:

* Killed by an OOM killer
* Program crash
* Terminated by virus
* OS crash
* Computer lost power

If these really do introduce a security risk, then it's very bad news for the user because there's not much you can do to prevent them.

Generally, perhaps the program has some clean up to do. For example, may be an encrypted secret gets decrypted and saved on disk when it starts, and the exit procedure deletes the decrypted version. If you forcibly terminate, the deletion will never happen. This is of course an insane design, but that hasn't stopped Gnome in the past...