How the Injured Person's Own Conduct Can Affect a Claim
In plain terms: in many states, a court or jury may divide responsibility among everyone whose conduct contributed to the harm, sometimes including the injured person and sometimes including the attacker, even if the attacker was never identified. Comparative fault, called proportionate responsibility in some states, is the system that does this.
Texas offers one named example, and it is Texas's rule only. Under section 33.001 of the Texas Civil Practice and Remedies Code, in an action the chapter applies to, a claimant may not recover damages if the claimant's percentage of responsibility is greater than 50 percent. If the claimant is not barred, section 33.012 reduces the damages by the claimant's own percentage. Who receives a share matters too: under section 33.003 of that chapter, the trier of fact determines percentages for each claimant, each defendant, each settling person and each responsible third party designated under section 33.004.
Section 33.004 matters in crime cases specifically, because it lets a defendant seek to designate a person as a responsible third party, someone not sued. Under section 33.004(j), if within 60 days after filing its original answer a defendant alleges that an unknown person committed a criminal act that was a cause of the injury, the court shall grant leave to designate that unknown person if the defendant has pleaded facts showing a reasonable probability the act was criminal, stated all identifying characteristics known at the time, and met the pleading requirements of the Texas Rules of Civil Procedure. Under section 33.004(i), designation or a finding of fault against that person does not by itself impose liability on them.
Put simply, for a person whose attacker was never caught, the property's side may ask that the unknown attacker be counted when fault is divided, so a share of responsibility can be assigned to someone who is not in the case at all. Separately, section 33.013 makes a defendant jointly and severally liable when its percentage of responsibility is greater than 50 percent, among other circumstances the section lists.
Other states differ. Some bar recovery once the injured person's share passes a threshold, some reduce recovery without a bar, and a small number still use contributory negligence. Because allocation affects what, if anything, a person may recover, a question many people bring to an attorney is how their own actions and the attacker's role may be weighed under their state's rule. The Texas negligent security page covers that state's rules further.