You can redefine terms any way you like, but coercion in response to coercion is still coercion. That's not an "economy void of coercion", just one where the monopoly on violence has been replaced by a free market of violence.

After all, if the person squatting on what you consider to be your property doesn't recognize your claim of ownership, it would seem that you pose a greater threat to them than they do to you, especially if you're trying to remove them from the property when they're not presenting an immediate threat of physical harm.

That's a quite an arbitrary definition of self defense