Pretty simple , first I would remember its Kickstarter. I've paid for the option of A) Helping fund the game to a point where it actually gets green lighted B) Some bonuses that might I might want depending on my donation size.
It was voted on , the sponsors of the project have spoken. Its as simple as that. What should they do? Ignore the voting process and please the second most voted for option?
Far as I'm concerned it will still be a great game.
Now if they took an RPG during development and turned it into an FPS , then you would have something to bitch about.
Look at it this way, if they announced it was RTwP would ANYONE have been upset? No, because that's what PST was and what most people naturally would expect the "spiritual successor" to be.
Now that they have went TB which PST wasn't you have people that are upset because it's not what they expected/wanted.
On one hand you wouldn't have pissed people off/made some want refunds, on the other hand you now have people that are upset and want such things.