The amount of force that can be used against someone who's broken into your home depends on context more than anything else. If the invader is attempting to harm you or your family then yes, lethal force is justified. However, very few break-ins are committed by blood-hungry psychopaths who want to slaughter you in your bed.

The type of home invasion you're far more likely to encounter is one which has been purely motivated for a desire for your property. In this case, shooting the intruder on site simply to prevent him legging it with your consumer electronics is assinine, unless you believe we should institute the death penalty for burglary, and rightfully illegal.

A human life is worth far more than your TV.