Of course you should help. The loan system as it stands now is designed with a parental contribution built into it. They should make this MUCH clearer and advertise it widely, as it seems to come as a shock to many parents. If your household income is above a certain amount your child is not entitled to the full maintenance loan and instead parents are expected to pay the difference to make it up to what someone from a less well-off family would be entitled to borrow. Why would you choose to put them at a disadvantage, if you are able to pay, just based on principle that they "should" be getting a job?
Of course, if they need or want to spend more than the maximum loan amount equivalent then they will need to get a job (or hope for an even bigger contribution from their parents if they come from a very wealthy family).
I actually think the system is wrong and if you're going to have a loan system everyone should be entitlted to borrow the same amount. They can't on one hand refer to the young person as an independent adult so much so that universities are not even allowed to confirm to a worried parent on the phone that their child is a student there or not, without the young person's permission. And on the other hand make it so that the system connects the young person to their parents' income. Which one is it? They're either an independent adult and should be treated like one, with parents not getting involved at all, OR they're not an independent adult and therefore their parents should be paying the top up and also have the ability to liaise with the uni regarding their child if they are concerned about anything? We've got a hybrid set up at the moment.
Not giving everyone the same maximum loan as a right also means there will always be some family set ups eg blended families with lots of children, where even if the household income is over a certain amount, outgoings are much more than average and they really are very stretched and simply cant' afford to top up any uni costs.
But I've seen far too many posts on Mumsnet where parents have this attitude of "if they want to go to university they need to pay for themselves", yet they refuse to make any parental top up. The irony of their comment - if they DID get the maximum loan they WOULD be paying for themselves (albeit a few years later through their pay packets). It's their parents' higher income that is causing them a disadvantage and not even allowing them to borrow the money.