Calc classes help them weed out students who wouldn't be able to crack later courses. It's not necessarily that you'd use it in your profession to the nth degree you study it, it keeps the dummies out 
I think its funny though that Im the only one in my major that took the course lol. Calc 1, was a requirement but I could have taken the easier science level calc like the rest of the science majors, no somehow I ended up in the engineer level. Calc 2 was a complete elective, why I took it no idea. The joys of college classes.
