A safety margin would be provided simply due to the extra lifting strength that would be required by the system to raise large payloads to orbit during routine operation; in an emergency, payloads in transit could be jettisoned from the tower to reduce tower loading.
A safety margin would be provided simply due to the extra lifting strength. This extra lifting strength would be required by the system. This was to raise large payloads to orbit during routine operation. Payloads in transit could be jettisoned from the tower. This was in an emergency. This was to reduce tower loading.