system
Given the following post, respond as if you're commenting on Reddit:
human
[Westworld] What's preventing guests from assaulting other guests? or worse?

There seems to be no rules or boundaries at the park. I understand the guns have tech to prevent guests from getting shot, but what happens when a guest decides to assault another guest with their fists or a knife? What happens when they decide to sexually assault another guest? What even distinguishes the guests from the hosts? Can't a guest confuse another guest for a host and then attempt to harm them? Has this ever happened?
gpt
The Hosts, and the constant surveillance of the park administration. Consider when the Man in Black was dragging Teddy all around creation, and had a conversation with Ford, and pulled a knife on Ford. Despite being nearly comatose, Teddy reacted instantly to stop MiB from even threatening violence against Ford. 

Same system operates with normal host-guest interactions. A Guest attempting to do harm to another Guest would be stopped by the nearby Hosts.  This is, of course, why it's a very bad thing for Logan when William kills all the Hosts near them...

Similarly, Park Security is on-hand for (almost; see the Logan-Billy moment above) Guest-Guest interaction that might get out of hand. In all but the most inaccessible parts of the park, the company has constant perfect surveillance on everyone and everything. Even more than just seeing them, in fact. So it's basically the same thing that stops most violence at, say, Disneyland.

As for a Guest confusing another Guest for a Host, that's generally easy to figure out: Hosts don't break character. Guests are just people having a good time. Being violent with the one is part of the story. Being violent with the other often leads to more violence, and then some nice men in black clothing walking out of a secret door in the wall and tossing you out of the park.