A few perspectives if I may:
My birds will ALWAYS be contained (by flightsuit, harness or carrier) when outside. That is my personal opinion, and quite frankly, my responsibility to them. They are not exposed to the outside very often, so it is an unfamiliar and scary place, though, from the safety of a familiar travelcage, mom's hand, or mom's hood in her sweatshirt (safely tucked under my hair of course), it becomes an enrichment exercise. Loki regularly goes with me to the local yarn stores in his flight suit, and is always happy doing so. Additionally, I would like to mention that I have a mixed species household (predator/prey animals), and I take many percautions to protect my pets, as I am sure the majority of us here do....I don't think either situation shows irresponsibility.
That being said, a different perspective on this discussion is the practice of free-flying parrots for enrichment. I was ignorant to this practice until I saw it at a bird show in Chicago. Most people are familiar with zoo shows that include birds free-flying and doing tricks, but in my mind, that was not suitable for pet parrots (mostly due to environment and training requirements). However, there was a very well known speaker at this show that was a huge fan of the practice, if done safely and your bird was properly trained. I am not comfortable with this idea, but was shocked to see how many people in the room raised their hands to say that they free-flighted their birds outside. Granted a majority of them were large bird owners (like macaws), but still, it was an eye-opening experience. Later, I got to see this practice in action as a lady took her hy outside and free-flighted it around the center, OVER the expressway, and whatnot of downtown Chicago. The bird did eventually return to its owner, but not when she called it to her (it took him about 20 - 30 minutes to decide to come back to her). I don't know, I have very mixed feelings on this practice. I know there are far too many hawks in my area to do this with (evidenced by the pigeons I lost when I used to turn them out everyday); but I have also heard great benefits to this - the training is the most important aspect. I have recently found out that in one of Woody's less-than-stellar-homes, his owner would often get mad about the screaming and literally throw him outside. He would spend his day climbing in the trees and whatnot, and then at night, he would perch on the porch railing and sleep. After a couple days, the guy would bring him back inside only to repeat the process when the screaming would start a week or so later....it's funny, we control the screaming by actually giving him toys, good food, and interaction
. I should note that Woody actually acts quite fearful when he is outside, so it's highly unlikely he screamed to be put outside.
Just some food for thought....