I don't see what's merciless about it. DB systems have various claims, he just goes about asserting if those claims are true. I think a serious take away fro

I don't see what's merciless about it. DB systems have various claims, he just goes about asserting if those claims are true. I think a serious take away from these is that all DB systems have issues, there are some faults that do happen, know them and design for it. Any DB that claims to have no fault is lying.