Shower thoughts this morning while listening to the NEOMIR project that watches out for asteroids heading towards earth from one of its Lagrange points[1]: obse

Shower thoughts this morning while listening to the NEOMIR project that watches out for asteroids heading towards earth from one of its Lagrange points[1]: observing is the first step, but why don't we ready a few missiles waiting in space/orbit in case asteroids head towards earth ? How hard would that be to maintain in working condition for decades ? The goal would be to remove the need to prepare a rocket from earth (lots of fuel wasted, etc.) and have lower response times in case a "big one" (or many smaller ones) are ever detected. [1]: https://www.esa.int/Space_Safety/Planetary_Defence/NEOMIR_finding_risky_asteroids_outshone_by_Sun https://www.esa.int/Space_Safety/Planetary_Defence/NEOMIR_fi...