Your not the only one experiencing this though. It also kills the mood to participate in this forum discussion if someone is happily deleting posts while in hiding.
Don't think they're hiding, I believe all moderators (who have the privilege to delete posts) accounts are open to the public. Just by viewing the boards you'll be able to find those moderating them. If alot of your posts are getting deleted more often then you should get the memo that you're not doing something right. Don't think any mod who purposely target any user, deleting his/her convenient on the forum just for personal satisfactions.
In regards to you getting discourage from contributing on the forum as a result of your previous contents getting deleted, that's not enough reason to feel that way unless your only motive to writing on the forum is because you're been paid to do so. Just take corrections and improved on yourself.