Here's some. I may get some hate for this buuuuttt....
Flaring is stressful. Bettas don't need interaction.
Flaring is only bad if it gets to the point the males are ripping fins. Since I keep mostly plakats I don't usually have this issue. I had an in depth discussion with transhipper and judge Linda Olson about "carding" bettas. She did experiments awhile back and concluded bettas are social creatures and communicate in their own ways (flaring). Generally flaring only lasts a few days between neighbors until the next water change. If you do card and flare your bettas it will give them an ego boost so to speak. They flare and then BAM the enemy is gone.... the males think "I'm awesome, I scared him off...".
*prepares for hate PMs/angry members D:*
Who am I? Well I am a Junior Member of the International Betta Congress and a breeder of white HMPKs, red dragon HMPKs, black/red dragon HMPKs, metallic multi HMPKs, blue masked HMPKs, and now multi color HMs. Soon to add black HMs. I will be showing in New Breeder class in fall of 2012.