All Accidents Are Preventable?

Really?

I think for the statement "all accidents are preventable" to become REMOTELY true (ish) we will need to add some words. For example:

All accidents are preventable... with the benefit of hindsight.

or

All accidents are preventable... in theory.

or

All accidents are preventable... given unlimited knowledge, resources, perfect prediction (and quite some luck).

All of which, regrettably makes it a rather useless statment in my everyday job. And besides, do we really want to prevent absolutely everything? Really??