Why can someone post a nazi flag on a creation, the Admiral Graf Spee for example, and not get removed or striked but anything else relating to nazism or anything else gets removed?

Your creation has been hidden from the Brick Rigs workshop. Reason: Controversial political post. Please note that along with many others reasons, the Southern States seceded mostly because of slavery. While to others the Confederate States flags represent Southern culture to many others it represents the continuation of slavery.