Board Thread:Support Requests - Community Management/@comment-26543034-20160119050750/@comment--20160119053233

Usually instinct is your most powerful tool when it comes to deciding to block someone. Ask yourself a few questions about if it would be a good idea.
 * Does this user contribute well in other ways?
 * Would blocking this user prevent any damage?
 * Would the user come back to editing after the block has expired? Would it matter if they did/didn't?

That would be the questions I would ask myself before blocking someone. If it's page creation trouble, do note that you can protect page titles from being created. Like this page for example. In the drop down menu you have an option of protecting it from being created again.