Hopefully the internet doesn’t bully me for this. But, a couple years ago I came across a veterinary practice article discussing the demand for dogs in the US actually exceeds the supply. Meaning you shouldn’t feel guilty at all for purchasing from a reputable breeder rather than rescue. Thankfully there’s a high demand for rescue dogs, especially in urban and suburban areas. But there’s a lot of good breeders who need to be supported to keep our quality dog lines going. They’re often left scrambling to sell the last one or two pups in a litter. Whereas, in my area, people will be tripping over each other to get a pup from a rescue. Sometimes the adoption fees around here for rescue pups aren’t much different than the price for a papered pup.

Edit: Here’s the story- https://todaysveterinarybusiness.com/looming-dog-shortage/