Recognition

Now and again (quite regularly) we hear about how Hamas and other Palestinian nationalist forces must recognise Israel before they can be recognised or before a Palestinian state can come into existence. Now, there is no Palestinian state. Israel exists. Israel's existence is hardly in danger given the power of it's military and that of it's major ally, the USA. Hamas recognition or lack thereof does not affect Israel's existence in any way. The existence of a Palestinian state, on the other hand, depends entirely on Israeli and US goodwill.
When it comes to recognition of a state, what of Israel's recognition of the Republic Of China? Of course, wether or not Israel recognises Taiwan is not really relevant, since the two countries have economic relations anyway. How about Tibet, then? Do the Tibetans not have a right to a homeland? Judging by China's fury whenever the Dalai Lama is met by world political leaders, it's safe to say recognition of Tibet by world governments would not count for nothing.