I gotta say that normally something has to go wrong to bend a decapping pin... but somehow my friend totally broke the decapping pin, and bent the shaft that the expander screws onto, in his 6.5-06 RCBS dies... in retrospect, I think he may have had the thing misadjusted so the expander was hitting the case head from the inside, and when he forced it, it bent the shaft (still hard to believe, but this was all brass that had been sized and used before in the same rifle and same dies, so I'm sure it wasn't a stubborn primer)... anyhow, I emailed RCBS for him (my friend does not have a computer, believe it or not), sent them some pictures of the decapping assembly, and they sent out a new assembly along with 6 new decapping pins (spares)... for no charge, no argument. Can't beat that! I've had and heard of similar experiences with most of the other reloading equipment mfg.
Don't sweat the breaking of a decapping pin; it has, or will happen, to all of us at some point... that's why I've got spares.