Essentially, emotional appeal is a method for delivering ideas, or at least opening up an avenue through which to do so. For good and for bad, of course.
Trying to instill shame and guilt and all of that is utter bullshit nonsense. It may work, but at what price? Have you convinced the other person, or have you simply forced them to begrudgingly carry out orders? Congrats, you haven't won a teammate so much as that you've recruited a sleeper double-agent who will have no problem stabbing you in the face at some point later on. And also, you're a dick.
We're bombarded with that sort of stuff all the time. I do trust that most people have the capability to at least recognize some of this negative emotional appeal, but we all fall prey to it to some degree.
There's such a thing as emotional appeal in a positive, honest sense. Best I can think of is using it to honestly establish some common ground from which differences can be discussed and hashed out. There's no sense in shutting out what might be good ideas because of a stark psychological barrier, and those barriers are easier to overcome than we think. When you do, you're actually honestly talking at the idea level, rather than simply walking away and having your own ideas further justified on false pretenses.