You are the very first person I have heard that have gas stolen from. I absolutely hater the keyed gas tank. But the idiot who stole your gas is some sort of special dumb.
According to your post, you turned the petcock and noticed gas all over the bike and ground. You must park your bike outside and had some gas left in it.
I like to look at the whole situation that surrounds the events of the stolen gas. Like CSI.
What time do you think it must have been that the gas was stolen? Date, day, time of day or night,
When was the last time you rode the bike?
You must have some kind of hose clamp on the bike, so the thief used a knife to cut the fuel line. If the thief would have tried to pull the hose loose a cut in the skin would or could have happened.
Now if there was already gas on the ground when you arrived to the bike then the crime could have just happened within an 15 minutes to an 1 hour.
Certainly was a person desperate for gas. Probably someone out of work that has a vehicle, or a teenager. Unless you have someone that has something against you.
sorry about that. THose acts sure can tick a person off.