Because it's intentionally a camera that blends into normal clothing so it's less obvious you are being filmed.
It's already possible for people to surreptitiously record/snap on their phones in their hands today, because walking around with your phone in your hand is common. What additional evils are the glasses enabling, if your stance is that they are evil? Or why aren't phone cameras evil?
Just looking for a consistent principle here. First it was "Meta is evil" and then you switched to "the public is evil and Meta is enabling them with clear intention". If the second is true, then you must have clear stances on the current popular technology that everyone owns already.
People who don't know these "Meta glasses" exist (and they shouldn't need to), would have no idea that the thing is even capable of recording.
It's subterfuge and while you could argue that this subterfuge was "unintentional", but imho that's mincing words, and also given that it's Meta, not entirely in good faith.
Can I assume that you have good enough eye sight that you don't need to wear glasses if you choose to? Because as somebody who is absolutely dependent on glasses as a serious aid, it leaves a very bad taste they are literally hiding the recording device in a disability aid.
I don't think making them glasses is "gross". It seems like a natural evolution of cameras to me. Even before Google Glass they were thrown around as an idea in scifi for decades. It's cool to me, but I understand public opinion isn't with me, and I'm fine with that.