Steinhauer - this is physics 101. the size of impact would be much larger than the projectile itself depending on trajectory of projectile, ground composition, etc.
A 0.7 miles diameter impact crater in Arizona was created by a 100-feet diameter meteor. that's really insane. so I wouldn't be surprised if a rover can make a huge impact crater like shown in pix if the ground composition made it like that. the physics in another planet is different from earth's physic so I wouldn't be surprised if a rover's impact crater in Earth would be much bigger (or smaller) than in Mars.
it's only "conspiracy theory" when a person does not understand it - no different from people in medieval time using biblical explanations for unexplanation.