[lapsed_pacifist]

Not true. A well built fieldstone wall is massive, we estimate around .5T per linear yard when we build one to 4ft. with cope stones. Sheep will not knock it over, but cattle can. For that reason, through-stones are allowed to protrude a few inches on normal pasture wall for sheep, but you should make them flush on walls for cattle because the cows will try to use the protrusions to scratch themselves and could knock the wall over.

A well built wall doesn't appear unstable. One of the tests is whether or not you can see any daylight through the wall, and the wall should easily support the weight of several people leaning against it.