I'm not deciding it, I'm just telling you how it works. The reward is what makes miners protect bitcoin. If there is no reward there is no protection.
What reward? Isn't a 25BTC reward enough to protect the network right now?
You know that will be reduced, right? Or are you cherry picking which elements you want to be forward thinking about?
Again you only see one single version of what could possibly happen. Why can't we have services that are willing to pay a fee for various reasons? It seems that you are ignoring services like GreenAddress who might be willing to pay a higher than normal fee to protect against double spends or for whatever reason they come up? Let me get back to the Internet analogy. I am sure that Google or Facebook pay a shit tons of money for their internet connections while you pay only dimes compared to them. You can not pay anything if you connect through one of the many available WiFi hotspots. Why can't we have this with the blockchain too?
Because it's distributed and anonymous. There's no way to distinguish between different kind of entities. Your free wifis are always severly limited. So much so that I've never bothered using it. They can be limited this way because they are controlled by central entities. There is really very little in the real world that can be used for analogies in the bitcoin world.