One thing I've learned in my job, in composing and receiving literally hundreds of emails a week for several years now, is that the receiver can't see facial expression, body language, or tone of voice to know what is meant by the words that are written.
This has gotten me into trouble a few times, both in the workplace and even in this forum. We should all keep in mind the fact that the written word, especially when it's hastily written, can often be misconstrued.
It's usually easy, in my limited experience with the FTF, to identify the real crackpots and they're usually taken care of pretty well by our MODs, who have a completely thankless job.
.....and that was my soapbox moment.