A Google search will find various stats on whether an IR makes you a safer pilot; it doesn't appear to be an unequivocal given either way. Perhaps whatever is gained in skill is offset by the higher risk flights that IR pilots take; suggesting some form of
risk homeostasis is at play.
Here is an excerpt of one such article:"[FONT=Arial,Helvetica,Geneva,Swiss,SunSans-Regular][FONT=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]A statement often heard from flight instructors is that the instrument rating “will make you a better pilot.” Certainly, our data indicates that this rating has some clear benefits both under VMC and IMC conditions. Notably, IFR-rated pilots enjoy a 50% reduction in the Stall/Spin/Loss of Control category under both VMC and IMC conditions when compared with their VFR-rated counterparts. On the other hand, the IFR-rated group got snared by other causes that seem to impact the VFR-rated cohort less often. First and foremost, the 6-fold higher mid-air collision rate under VMC conditions by the former group was obvious. Second, under IMC, following improper procedures leads to deadly consequences for IFR-rated pilots, this presumably reflecting the unforgiving environment.[/FONT][/FONT]
[FONT=Arial,Helvetica,Geneva,Swiss,SunSans-Regular][FONT=Arial,Helvetica,Geneva,Swiss,SunSans-Regular] In total (both VMC and IMC accidents), there were 67 and 58 fatal accidents involving VFR-rated and IFR-rated pilots respectively. However, in general aviation, VFR-rated pilots (258,749) outnumber their IFR-rated peers (171,309) (source: AOPA,
www.aopa.org/whatsnew/stats/). Correcting for this increased presence of VFR-rated pilots, we calculated 26 fatal accidents per 100,000 VFR-rated and 34 fatal accidents per 100,000 IFR-rated pilots. The slightly higher rate for the IFR-trained pilots did not represent skewing of the data under the more strenuous demands of IMC, since a similar trend was evident under VMC conditions (16 and 21 fatal accidents per 100,000 VFR- and IFR-rated pilots respectively). Likewise, increased exposure of IFR-rated pilots, who generally have higher flight times than their VFR-rated counterparts, is unlikely to be the cause of the increased accident rate for the former group. Thus, for pilots with 200-1000 logged hours, the fatality rate was 9 VFR-rated pilots and 10 IFR-rated pilots per 100,000 pilots with the corresponding rating.
Taken together, our findings, albeit with these aircraft, would suggest that while IFR-rated pilots do indeed have a greater control of the aircraft, this rating does not confer a lower fatal accident rate.[/FONT]
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http://www.swaviator.com/html/issueSO02/Hangar91002.html