Let’s say the house across the street is on fire. You hear someone trapped inside, calling for help. The only way in to save that individual is to kick down the door, go inside, and pull them out.

“Necessity,” under the law, means that should you kick down the door, you could argue you should not be charged with breaking and entering because force was required to prevent a greater evil. It was necessary, in this situation, to enter someone else’s property without permission. It wasn’t trespassing, wasn’t a crime. It was a rescue operation.

https://www.ncronline.org/news/justice/despite-legal-setbacks-plowshares-7-hold-religious-freedom-defense