I had my birds' wings clipped recently, and it was a tough decision. I do believe in birds having flight, but I also believe in safety. Our pets aren't in the wild... they're in cages in our homes.
I felt a LOT of guilt after I brought them home from the vet, and they were upset after their first few attempts at flying. They used to fly around the room, and had a few high places they liked to hang out. They fell a lot their first week, and I felt immediately that I had made a huge mistake.
It only took a few days, but my birds started to attempt longer "trips." They learned through trial and error how far one trip would take them, and were even flying up to land on high objects, which is something clipped birds aren't supposed to be able to do. I called the vet to tell them they didn't clip enough, but she said a clipped bird who wants to fly will find a way.
It has been about a month, and you wouldn't believe how much these two can fly with clipped wings! They can cross the room, fly up to their favorite high places, and turn mid-flight. I would say the only difference is they can't hover mid-air anymore, and they fly shorter distances with a little more effort. They spend more time climbing and running around outside of their cage now, which they didn't do much of before they were clipped, and they're also easier to catch if I need to change cages to bring them somewhere.
When I see how much exercise my birds get, even after being clipped, I feel I made the right decision. I think the age of the bird is important too, as my first lovebird was clipped very young. I got him when he was about 4 months and had been clipped for a few months already. Even as his flight feathers were growing back, he could only fly in a straight line, never up. My birds now were almost 9 months when I had them clipped, and perhaps the growth of certain muscles helps in this situation!?
I would also say that clipping shouldn't be something a bird owner does so they don't have to put in any effort. Taming involves trust, not forcing a bird to like you because it has nowhere else to go.
My final word on the subject is: It's your decision. A clipped bird is better than a dead bird.