I personally don't mind if moderators change or delete my posts. They have never deleted a serious or good post yet.
Most of the time you do not get notified and this is quite understandable since it would increase the workload considerably for the moderators.
I can imagine that some people really get upset when a post or thread gets deleted, but you must first question yourself on the nature of your own posts. Then think if you might be able to improve on the previous post. If not, let it go. If you can, try again (but not 5 minutes later). Give it a rest for a day. Think if it is really important. Think how you can improve your post.
And in the end realize it is just a forum. We are not writing a new version of the bible.