No, as long as they have volunteer experience it's fine.
Of course not. If you can afford not to, then you don't need to work.
No. There is no obligation to find a job while on summer break. Most students go to work for the experience and the extra cash.
No
No
Because they are lame
No, most of them don't work in the summer
Nope
No
No, not all. Only some.
There are a lot of things university students can do. You can do volunteer work. Start your own business. Write a book or song. Go to the beach!
Many need to work to help pay for attending college/university and for expenses.
So they have money to live off of.