Why would you choose a rifle inside a house? Your target isn't hundreds of yards away. Seems like anything with a long barrel would be hard to work with.
Several reasons:
1. They aren't hard to work with.
2. Ballistically speaking, they are much, much more effective than a pistol. Bottom line, pistols suck compared to rifles.
3. You can acquire a target very quickly with an AR15.
4. High capacity.
5. With the proper ammo, the chances of overpenetration are nill.
6. If an intruder were to break into your house, and they were carrying a rifle, you will need equal firepower.
HTH