I'm sorry to hear about everyone's bad experiences with non-knife/clumsy/careless people.
I haven't had any of my Spydies misused by friends, but I was severely peeved when my brother-in-law lost my sister's Delica 4 that I had gifted her. I helped her pick a new favorite knife, a Native LW in S35VN, and I made sure to stress to her the importance of not lending her knife to anyone, not even to her husband.
I've had an instance recently, though, in which I sharpened kitchen knives for my own in-laws, only to have one used to cut a pie out of a Pyrex baking dish. I cringed visibly, and at least my wife understood my discomfort at the wasted sharpening. I've since decided that I won't be sharpening knives as willingly for others anymore in addition to rarely lending my personal blades to a select few. If it's a particularly special blade (other than standard production FRN/FRCP models), I don't lend to anyone but the wife.
Own: VG-10 Delica, Old S30V Native, modified Breeden Rescue, VG-10 Delica, HAP40 Endura, ZDP-189 DF2, S110V Manix LW,Pakkawood Delica, Cruwear Para 3, SE H1 DF2, M4 Manix 2, HAP40 Caly 3, S90V Native 5, K390 Urban, Pakkawood DF2, Cruwear PM2, SE Pacific Salt, HAP40 Jazzlica, S110V Native, P.I.T.S., DLC Manix 2, REX 45 PM2, Para 3, XHP Manix LW, Superblue Caly 3, 20CV PM2, Rhino, SB Calypso Jr., B70P, PMA11, K03, ZDP-189 Stretch 2, Kapara, REX 45 Military, 154CM Manix LW, 204p PM2, Swick, Supergold Delica, backlock Lil'Native, AEB-L Urban, HAP40 Stretch, KC Cruwear Manix 2, Cruwear Military, M390 PM2, Cruwear Delica, 4V Lil'Native, Mantra 2, CruCarta Shaman, M390 Para 3 LW, M390 Manix 2, K390 Police 4, RexWood Shaman, DLC Cruwear Shaman, Rex 45 Manix 2, Native 5, Native LW, 204p Para 3, S45VN PM2, S90V Manix LW.
Waiting for: K490, Swick 5, and something purple.