Why would one have to "defend" legitimately logged flight time that placed in their FAR 61.51 logbook?
I can certainly understand an airline saying, "we discount SIC time in aircraft that don't require SICs" or "please filter out all safety pilot time" or "Cessna 152 SIC time not counted" or anything similar with respect to any other flight time, if they don't think it's of any value.
But with saying that one would have to "defend" legitimate entries in their logbook, you seem to be suggesting that you, as an interviewer, and the airlines in general, don't understand the regs. And considering that compared to simple 61.51 logging issues (most of which have consistent FAA interpretations going back 30 years), the regs that apply to commercial ops and Part 121 carriers are infinitely core complex, that's a pretty scary thought!
...Well said