And you could argue that weighing a fish or retaining it so you can set up a photo is unnecessary. Plenty do, including barbel anglers.
Next time there is a match on your local river have a walk along the bank after the fish have been put back. They don't all happily swim away. I used to do that and took a pike rod. There were plenty of baits available. And plenty of pike too. They knew.
How does this relate to the OP being wrong to deplore pics and vid's of 6 big barbel? That's ok because no one has clean hands? Nobody should retain fish or take pics because it's all equally bad? No, there's better and worse fish care and different degrees of selfishness and abuse, even though we all catch them and take pic's now and then.