I think you should consider how much pressure the particular lake you are fishing gets and then let your conscience be your guide.  I really don't think there is a one-size-fits-all answer.

Wally will tell you what you are allowed to do legally is the only limit you need to worry about and in one sense he is right.  He's also entirely correct that what Osthoff thinks should be a total non-factor.  Just because someone has the ability to share their opinion with large numbers of people doesn't make their opinion any more correct.

I will tell you that fish aren't capable of the level of higher thinking you assign them that they would require to be traumatized.  But that's just my opinion (based on the research I've done).  You are of course entitled to your own opinion.

Bottom line, if I'm fishing a heavily travelled/fished lake in the BWCA I'd be far less likely to eat a meal of fish from those waters.  If I was on a dead-end side lake with no campsites, I'd worry a lot less.  But I fish the Q far more often, mostly because there is a lot less traffic/pressure and a lot less need for me to worry about sustainability.  I will eat multiple meals of fish and I will not stop fishing just because I've caught a meal.