If you have Windows, the strength of your door makes very little difference, and I’ve known ideological pacifists who have actually opposed courses in unarmed self-defense. The ones I’ve known have respected positive change though, and do tend to become more accepting as a result.
That's a really good point. So in my advice to my relatives I include bedroom doors in my discussion. Harden those doors - and the bedroom windows - as best you can. And alarm the house if you can afford it.
And keep a working phone and Fox pepper spray in each bedroom. (No I don't work for Fox, it's just that the pepper spray you see at grocery check-out lines is worthless.)
This is all far from a perfect solution, I know.