I think this debate (as is often the case on this site) can be reduced to what the employee deserves to receive vs what the employer can aford to offer. The more that employers are required to pay, the fewer there will be who can employ them. So, it ends is improved benefits for some and no employment at all for others.
I think the trick is to strike a balance before the contract is signed. This is in fact what Lisalisa is trying to do. She posed her question to other nanny employers trying to find out what is fair/required by law. Then, she of course has to balance it with what she can actually pay.
And I do think there were more outside points about what is/isn't fair that were diresced at Lisalisa... but they are in fact points which don't apply to her.
The fact remains that employers (parents) are not required by kaw to provide more than SSP. If an employer can provide more and wants to, then by all means that can be done. And, if a nanny doesn't want to work for someone who isn't offering sick pay, then she doesn't have to accept the position.
As for firing someone BECAUSE they are sick. That is not only wrong, but illegal. No one is suggesting it should be otherwise (except maybe Chicpea who I doubt will be back on this thread any time soon).