I used to be a criminal. It didn't deter me, sorry. What it does is make me and my colleagues more ruthless to ensure no evidence is left.
We might burn down the house after burgling it to destroy DNA.
Or stab the people in their bed to bury the evidence and ensure they don't see us and tattle.
It doesn't deter people based on "Oh teh scary policemans." it might deter them based on "I'm unwilling to shoot a guy for a pack of gum." but soon enough it normalizes, and once you see those killers getting away with it, oh well. I need my gum.
You clearly have no idea how criminals work. We don't plan on getting caught, and increasing the badness of prison just makes us more determined not to get caught. It has no effect on crime, and studies have shown you this time and time again.
All you are doing is making the world a shitter place. Don't vote please, you're clearly doing it wrong.