My idea is You can assault another player in YOUR CLUB, but HE CAN'T assault you.
Why? Because it's your own club and you 're the boss here.
At this round while triping, you can meet another player who can have more stats than you and he can take your stats in YOUR club. But, When you'll enter to another club which you aren't owner and you'll meet another player which isn't owner too, there you could assault him and he could assault you too. Ofc, Owner of club can decide if he want to assault someone in his club, single or gang assault. So... not everybody have to be a hitman, and that will be protection for gangsters, buisnessmans, pimps, robbers.
I think the assault on owner of club could be carried out by gang ONLY.