If they aren't and you don't participate, you are consenting to the outcome. Even if that is the outcome that was less desirable.
Everything you write here is the exact kind of cynical, pessimistic motivation many need to hear... in order to convince them to not participate. To not vote. And the kinds of people you're going to drive away are the ones you need active and participating to further your agenda.
These people who tell you that the Democrats are perfect and great and have no issues that are being invoked don't exist. Pretty much no one thinks that. And I'm sure, push come to shove, you probably do vote strategically because only a true moron wouldn't.
But this position you're out here arguing for isn't one that is going to let politics get pushed left. It's going to push it right. You're achieving the opposite agenda by telling people not to vote strategically.