I agrees with the underlying point you are trying to make. Trying to ban semi-autos and take them away from lawful gun owners makes about as much sense as banning pickup trucks.
But, along the same lines as my current argument and using your metaphor: a person with a pickup truck is more dangerous and can do more damage than a person riding a bicycle...
"Nuh uh! A vehicle is just an inanimate tool unless some one decides to use it dangerously! Someone with a bicycle is just as deadly as someone with a pickup truck!"
(-Fishbone, probably...)