If you have concerns about safety, contact staff at Special:Contact/general. If it's the vandalism of toda,y I've reported that to VSTF for cleanup.
As for finding out who the perpetrator is, that depends on the law in your jurisdiction. They've left their IP Address - 49.197.3.170. While that can be freely traced to a rough and often inaccurate location (in this case, Tweed Heads, NSW), ISPs do not divulge the end user. That usually requires a court order, depending on the law of the land.