Timeliness, usually. Destruction is usually a batch job so if you care about risk of data exposure in the time lag between being able to wipe the drive (usually

Timeliness, usually. Destruction is usually a batch job so if you care about risk of data exposure in the time lag between being able to wipe the drive (usually an online, relatively low-hassle activity) and destroying the drive, wiping is worthwhile. Again, thread modelling is crucial. There may be no point wiping!