That's not what the programmers want. It's how they're incentivized. If you have to meet your "they're not deadlines but, really, they are" sprint targets, then what can you do but minimally complete the tickets assigned to you and hope not to step on anyone's toes?
It doesn't help that good programmers get flushed out of the industry due to conscience and age, only to be replaced with cheap, shitty ones.