The point is that lego is selling out their soul to gain more money by making lego versions out of what they believe would attract children the most.
So?
Let them get money for forgets sake, they need it to
- buy petrolium for making their bricks
- buy fuel to transport the sets
- pay for equipment
- pay for packaging
- pay their employees
- pay stores to host their products
- and probably many more things that need money
Also, lots of kids like Cars, Star Wars, etc.
If you didn't know, Lego is primarily targeted at kids, so kids would like lego if kids like the stuff Lego makes some of their sets from.