Well most of us have had issues with predators.
I myself lost one that age to a hawk at about those ages also.
Most people will tell you that the hardest part about keeping poultry alive is that everything else wants to eat them.
I don't think either of you are wrong, its just a matter of perspective.
Here's an example, I've got ducklings 2 weeks older than your younger chicks. I haven't put them outside without supervision until today because even my adult drake wants to eat them when he sees them. (You would never guess it by the look of him, he's the friendliest drake to humans that ever could be. He even comes right up to me and rubs his bill on my finger.)
So imagine my shock when this friendly drake the first time I put the small ducklings outside goes straight after them so fast I barely stopped a duck murder. And that took only a few seconds when he saw them to decide 'food'.
Do you have a pen to put them in? Something safe? And night predators are often worse than the day predators.
Also, I was running some math figures and it seems like it would be cheaper for me to buy electric fence kits than buy material and build a second coop just for ducklings. And by doing so I could even have more options because the poles etc would be adjustable and moveable. (Although this doesn't account for winter.)
So it depends on what you have as an alternative.
And if yours are in a garage, there's not really any harm I think.
(People will notice if you are putting cocks outside though, because right around after ...shoot I forgot the right age... at some point the cocks will start making noise.)