Kids can pay off fees at the age of 16 or 17. Most kids at the age of 16 and 17 work and have money. Most people have money saved up for college but still have money to spend. Not all parents are willing to even pay their kids fine because it's their fault, not the parents.
The driving age should not be raised to 18 because it's not going to make a difference on crashes. It's the inexperience in the 16-year-olds. If you raise it to 18 it would just mean there would be more crashing for 18-year-olds. Studies say most adults at the age of 18 start heavily drinking causing more drunk driving. By raising it to 18 all we would be doing is delaying the deaths two years.
The driving age should not be raised to 18 because it's harder for the parents. Some parents can’t be there to pick them up from school. They won't be able to get to their work. And they might have to be reliable on older siblings who are not necessarily reliable.
The driving age should not be raised to 18 because, it's not the age, its the training. They get trained the basics, and what to do for your license. But they are not taught to master the skills that a collision-free driving needs. They certainly were not taught how to avoid common risks.