Zevon:
It seems that there's some confusion here
Pure oxygen is highly reactive and promotes rapid combustion and increases the burning rate of combustible material. In the presence of fuels, this leads to fire and explosion.
Oxygen in contact with easily oxidisable, organic, or other combustible materials may result in ignition, violent combustion or explosion. Sparks or flames are not necessarily necessary to ignite an oxygen-fuel mix. Furthermore, nearly all materials burn vigorously in oxygen - including dry textiles enriched with the gas.
Now you may say that in the absence of fuels, fire and explosion would not occur. However, because oxygen can utilise an extremely wide range of materials as fuel as illustrated above, an explosion becomes virtually inevitable.
It follows that from a practical standpoint, oxygen is explosive.
To illustrate, applying certain types of grease around the outlet valves of oxygen cylinders will allow oxygen to explode spontaneosly. You will note that we are not even discussing the more serious risks associated with friction, sparks or flames at this point.
If you're still sceptical, find an account on the internet of the Apollo 1 explosion. Alternatively, find a hospital worker who can tell you about the training they have received regarding the danger of explosions at the outlet valves of the oxgen piped to wards.