This is from the Forum Rules:
The moderators reserve the right to delete any content they regard as inappropriate. When posts are deleted an explanation may or may not be given depending on how obvious the problem is. If you notice one of your posts has been deleted and do not know why, please email the administrator for an explanation.
Any topics that are contentious and likely to cause heated debate should be posted in the Controversial Topics section. This includes Brexit, immigration, muslims, LGBT, left vs right politics, etc.