It wasn't your fault. Or the bagram's. Tools are tools... they don't hurt anyone till people use them to. And if someone uses them outside what the creator meant it for, the pain that's caused is that bastard's fault, not the creator's.
* tightens his grip. *
But... even then, for someone like Feathers, to see the work your feelings went into--- a work meant to help your important person reach the sky, turned to bring down not just him but so many others... it would've hurt beyond anything imaginable.