Most mass shooters are dead or in custody within the hour purely because they linger at the crime scene long enough for the police to arrive and cover the exits rather than getting the hell out of there as quickly as possible once the deed is done.
The reality is that if someone really wanted to, they could mask up, murder a huge room full of people, disappear into the woods, and it would take weeks for police to even identify them.
Most mass shooters are dead or in custody within the hour purely because they linger at the crime attack long enough for the police to arrive and cover the exits rather than getting the hell out of there as quickly as possible once the deed is done.
The reality is that if someone really wanted to, they could mask up, murder a huge room full of people, disappear into the woods, and it would take weeks for police to even identify them.