It can certainly be done because all situations and loft locations are different but I think it is generally not a good idea. Another problem with letting the fancy pigeons fly is that they generally have very poor homing ability. If they get chased off by a hawk they might escape, but might not find their way back home. I believe this happens with roller pigeons often. I try to help out local rehabbers with lost domestic pigeons when I can. About 50% are lost race birds and the other 50% are fancy pigeons that flew too far from home and got lost.Since fancy pigeons are more vulnerable to hawk attacks, do people who own them keep them in the loft and do not let them fly free?
I had never even seen a Cooper’s hawk in my entire life and I distinctly recall seeing one land on the loft on the second or third day I had pigeons.
Number one rule of pigeons is never free fly a pigeon you are not prepared to lose!