Oldman, Cshoff, I think your both right to a point.
My point in every one of these home defense discussions is TIME. Time react and put yourself in situation to be proactive. To be proactive instead of reactive may save a life.
Whether it's time to gather the kids and move to a safe room, grab a gun, seek cover, call police etc......
Time is everything. It's why we are trained to MOVE AND SHOOT on the street. It's no different in the home. By giving yourself some time to better prepare yourself for a fight.
Given enough time, the need to hurry and scurry about the house becomes unneccessary. Time and a plan will put you in a better position to win.
As a professional locksmith I have helped people secure their homes for the past 20 years. Most people think that we stand around and cut a few keys or open an occasional car. If they only knew. I even made a key to the trunk of a guys car. Little did I know there was a dead body inside. I didn't find out until the local police called me in for questioning months later after they caught the guy. The customer insisted that once I made the key, I was NOT to open the trunk. If I did I probably wouldn't be here now.
Many people I help have been robbed, burgled, invaded, and sometimes worse. Every single one of them was not prepared.
The last customer I helped was an older couple in a middle class neighborhood. The burglar broke in through a service door under their house which was built on a hill side. Once inside he waited until they went to sleep. He then cut a hole through the drywall and went inside the house.
He then sat on the couch for a while to make sure they were asleep. Then he stole what he could carry.
The couple heard the front door open and close and knew there was someone inside. They stayed in the bedroom and called police.
Once the cops arrived they sent in a dog. The dog tracked the burglars sent throughout the house. Turns out the burglar even entered their bedroom and walked around both sides of the bed.
The burglar stole some valuables and made of with their car including house keys.
The couple didn't sleep well for weeks after that.
The moral? Prepare well. Look at your home at all angles. Think like a theif. I tell my customers to do whatever will help them sleep at night.
My house? My one and only weekness is someone following a family member inside. But fortunately, I can see who comes and goes well before they reach the front door.
I have the strongest deadbolts made. The strongest strike plates. And strong steel doors. All PROPERLY installed. All the glass is protected by a laminate film. They only way in without a key is to drive right through the front door.
So, if someone tries to get in, whether we are awake or asleep, we will hear them. And we will have plenty of time to be proactive.
Both my wife and I grab our glasses

, gun and flashlight. Then we call for help. She goes to her fathers room right next to ours and I cover the hallway. She only shoots if I'm down and someone enters the hallway.
Sorry for the long read. But I believe home defense starts at the perimeter and then inwards ending with firearms.