You should install one solid piece of metal, which starts one foot above the lock and continues one foot below. This will make it very difficult for the burglar to get through. Inside the house, either a thumb lock or key can open the deadbolt. If using a key, you must leave the key in the lock at night when people are home. If the key is not obvious, you will not get out.
Fire survives on oxygen.
While if is burning in your home, it can and will deprive it's occupants of the necessary oxygen to sustain life. You become incoherent to your surroundings and can't find a way out. Flood lights are an excellent deterrent. Go to home depot and buy a motion-sensing floodlight. It's a proven fact that a house that looks lived in is less likely to be burglarized.