Why don't other Martial Arts respect Tae kwon Do?

I respect it quite a bit. For those that don't respect taekwondo go look up the fight science kick test, and then tell me that kicking with 2000 lbs of force isn't effective. I've actually met many taekwondo practitioners whom I literally believed could kill me with one kick if they felt like it, one is about 200-ish pounds and kicks like a monster, the other was only say 140- or 150 but still kicked crazy hard.