Nonnel there are so many things wrong with your post.
1. Police can't just kill people. First a command has to be given to the suspect to order him/her to drop his/her weapon. If the Suspect does not comply or just shoots before any command his given, the police can open fire. However most likely they are going for a shoot to wound. Police might be paramilitary, but are peacekeepers not soldiers. The job is to detain the suspect and charge him for his crimes.
2. Even though it goes against what the founding father wanted, the judge would most likely set the suspect bail so that their would be no way that he could flee after his bail has been paid.
3. If he kills himself in prison, then that is his choice. He gets the death penalty, the fine, if he gets life fine. However wishing for revenge makes us no better than him.
The police did good today, they contained the crCIA and were able to reduce the amount of causalities as much as possible. However this should be a lesson that no matter how many laws or gun free zones you make, people will continue to break the law.