(getting off topic here...) That pdf seems to be missing one crucial piece of information: the total number of turbines installed per year (or I can't find it). A 16x increase in (documented) accidents (not all of which are of equal threat) over 16 years does sound pretty dire and damning, unless the rate of installations has been growing at a larger rate. Do you know of any resource that provides that? I can only find megawatt rate of growth (which is a useful metric too, but not as usefully comparable since the events in this pdf seem to be primarily related to installations, not the output of the installations).
Nothing is going to be completely safe. It's valuable to get accidents and events as close to zero as possible, but I suspect that's being done by increasing the denominator rather than reducing the numerator.