Safety isn’t a shell, it’s a habit. Shells, gates, and borders can hold us while we grow and hold back an enemy on attack. But, when you’re grown or the enemy breaches the wall, your safety is in your strength, skill, and preparation for struggle within your borders.
Unless you walk, live, and remain at large within your domain, you have no domain to keep your liberty. When we exercise our freedoms, it has a policing affect against burglars who would sneak over our fences and lay traps in our own back yards. We are only as free we walk.