My fanon: There is no heroic quest here, nor even a grocery run. They could have easily gone around the walled in area. But when a Triceratops lets you ride them, you want to do more than just having them run around, especially when you can gallop yourself.
and build it strong,
‘cause we’ll be there
before too long.
Who says it was “back then”? You’ve seen Jurassic Park, right?
#JustTriceratopsThings