I think there is an issue of semantics here, maybe I am not tracking. I’m going to go with defensive and offensive in terminology as the way I see it given that The_Katar has said this is a solo operation.
The only time I would 100% absoluteley engage in clearing a structure alone is an in extremis setting. I.E. HRT or if I reasonably believed that bad guy(s) with ill intent were between me and a loved one and I had to close with them.
To me this isn’t defensive clearing, this is offensive. I have made the decision that what I am about to do will very possibly result in my death or injury and have accepted that based on the rescue of innocents. (HRT principles).
An offensive HRT operation has a lot going for it that the lone operator can;t bring to bear. Multiple entry points onto a target area, distraction devices and other tactics, flooding an area quickly, and aggressively with people trained to do exactly that. What we’re talking about here is one guy against all odds, we might have our hand forced and make the decision to do this, just as long as we’ve made the decision that dying is an acceptable outcome.
“Defensive” clearing on the other hand to me is something that while we might do, (bump in the night) we have to honestly admit that there is no need. The risk/benefit is probably against us, we don’t ‘know’ that a bad guy is there. We could in all reality wait for help. But…we choose to clear the house anyway. “It’s probably nothing”.
I do investigate bumps in the night, but if in the process of that, I discover/hear/see something that leads me to believe there really is a bad guy(s) around the corner, and I know that my loved ones are safe with me between them and the threat, i am going to stop my clear, hold that ground or pick a better defensible location and wait for back up.
As OPFOR for my team, I get to be the bad guy at least once a month. God help the new guy, or guy that is having a bad day and screws up the entry when I am inside a room and expecting company. The punishment for doing that on my team is painful, and it should be. You have a 50/50 chance of making the right choice as far as which way to turn, and even if you choose correctly, and your partner(s) execute as they should the advantage is still with the defender since all he has to do is watch a doorway and blaze away at movement. Your opponent doesn’t care about backstops, or having to be accountable for every round, and is going to behave accordingly. You have a much higher burden, especially if this is a “do or die” situation where an innocent life of someone you love is on the line.
After every entry and exercise I sit down afterward and write down lessons learned, over time I’ve come to realize that good intentions aren’t good enough. Good solid tactics, developed and honed thru frequent training, executed as a team is what improves your chance of success. Even if everything is done right, the likelyhood of assaulters taking casualties against known armed defenders is very, very high. Protocols and tactics are developed with that in mind.
I’ve probably muddied the waters on this, if so I apologize. If the regular homeowner takes anything away from all this, i hope that it is : Make an honest decision as to whether you are going to go hunting for bad guys in a structure unless there is a life or death reason to do so. This has nothing to do with machismo or cowardice.