The Terms of Service spelled this out pretty clearly, and our policies are also well-known for those who have posted awhile. That said, note that these were threads in which you participated, not topics you started, and so the problem areas were not in your posts, but those of others. When a thread "heads south," though, the whole thing generally has to go.
When a specific question has been asked, answered, and acknowledged by the original poster, it too will come down shortly thereafter.
The capsule summary is: Keep it clean; this is a family site. Stay on topic; posts must pertain to the car-modeling hobby. Leave politics, religion, and personal issues behind. Be civil and respectful. Use PM or E-mail for serious criticism or arguments.
As for two people complaining and a post being removed, remember that I too get private messages from members, so although you may only see one or two, there can be (and often are) more than that.