Free: Contests & Raffles.
Remember they have the same genetics at a year old when their a spike as they do at 3 years old and a 4 or. If you shoot the first "older class" buck you see you are not changing the genetics. You would have to selectively pass bucks with good genetics and kill a buck with poor genetics wich you may or may not be doing anytime you shoot a young buck.
I can chime in on the other end of the spectrum. I took up bow hunting because it opened up the pool of legal animals so vastly. I love hunting almost as much as I love eating wild meat so I never pass up a legal animal. I've taken does and yearling bucks exclusively since switching to archery. I don't feel bad about it at all but I get that it's not everyone's cup of tea. I think it all boils down to what your primary motivation is. Mine is meat
I wouldn't confuse ethics and preference. Shooting a forkie when it is legal is perfectly ethical in any book I subscribe to.