> but doesn't prevent any premeditated ones Not all premeditated attackers are equal in motivation and ability. Make the obstacle high enough, some people will

> but doesn't prevent any premeditated ones Not all premeditated attackers are equal in motivation and ability. Make the obstacle high enough, some people will still make it over, others will either lack the motivation to scale it or the ability to do so. Lower the obstacle, and suddenly that later group gets over it too. "Premeditation" just means the attacker intended to do the act before-hand. The degree of preparation involved varies widely. Some premeditated attacks are the fruit of weeks, months, even years of preparation. Other premeditated attacks are triggered by a recent stressor, sometimes only days old. Gun control can make a big difference to the odds of the later kind of premeditated attack, but makes little difference to the odds of the former kind.