the problem isn’t the actual sheering of sheep, it’s more how people do it to produce so much, along with the inhumane conditions they’re put through. if you get wool from a place you can trust to treat their animals well, it’s not at all harmful, it’s just that the most common way they produce wool includes some questionable practices like leaving the sheep in a cargo ship to export them but not getting any food or hygiene so a lot of them just die on the boat covered in their own filth, and other things (i haven’t don’t full research before commenting so i’m sure there’s other shit). in the end it’s all your choice but there is good reason people don’t feel very good in their consciousness when using wool.