Boy, I wish I could find the right words like that! I get so upset when I talk about the guy that I probably become not believable..and then I get so upset about all the hurt they all did to Sarah that I am not believable either...ah...way too passionnated to convince anyone so I try the email angle.
Your passion is your strength. Speak from your gut and tell them exactly how you feel and why. You do not need facts on a sheet of paper to do that.
As libs they think with their guts. Do the same with them. Then when they try to convince you that your emotions are all wrong, get angry with them for trying to put you down.
Remind them that you have the same right to your opinion that they have. IOW throw their beliefs back in their face and show them how they are doing and saying precisely what they hate.