Is stealing Bitcoin illegal?

Stealing is always illegal, if you take something thats not yours you automaticly can get punished for that

In the use they could charge you with wiretapping.

who cares mate just bloody steal it, you only live once mate

I don't know how it's going on when you are under regulations which not reconized the BTC like some asians laws.
How you can punish someone stealing something even not legal ? because the victim will not complain

stealing is always illegal and you can never steal without it being illegal. in the end it depends on how you steal it and where you live and the laws.

Your question is "Is stealing illegal?" The answer is yes, it is. Taking things that don't belong to you is a crime.