It's not like Israel is - not talking about the truth of that claim here - denying the very existence of their neighbouring states. On the contrary, palestine and part of the palestine people are branded as great evil. Being branded as _anything_ is being "known". Famously or infamously.
It's a sort of reverse branding exercise. If you can reduce exposure as much as possible there's not going to be a lot of sentiment for supporting the cause. What would be of Palestine today without the exposure that has been directed at it.