Chicks can be raised safely outside, too.
It's just a matter of getting the conditions right: predator-proof pen, correct temperature, enough protection from wind and rain.
I raised chicks outside in Virginia one summer, in a dog kennel covered with hardware cloth, with a tarp over 3/4 of it and a heat lamp inside. It worked pretty well. (They went outside the day they arrive at the Post Office. The space was 4 x 6 feet, and I think there were 15 chicks, with no...
Those nice tight coops: the first thing we tell them is to add more ventilation. :)
And hardware cloth is just as good as some kinds of siding, when it comes to keeping out predators.