Paypal insecure?

I read this on another forum when a seller refused to use Paypal:

"
I have heard such a horror stories from internet. Paypal doesn't offer any protection for sellers. Buyer can even send an empty letter back to seller to get a refund from Paypal. Just say that you want to send the item back you have purchased and provide a tracking number to get a refund."

I wonder if this is true??

I paid the seller via bank transfer and got the item as described.