2)Your wishes will still be respected assuming you took the relevant steps before you died. The difference now is that the default assumption is that you aren't selfish enough to deny life and quality of life to those who are left behind. It's not likely you need your heart, lungs, liver, corneas etc. You are, at this stage, already dead.
3)If one is sufficiently selfish to doom those in need of a transplant, there's a register for that.
4)Your body probably isn't going to just stay wherever you died anyway. The responsibility for dealing with it is transferred to others regardless, what with you being dead and all.
Sorry, you mean some critical organs used to save others lives after you die?
Or where you planning to use that lovely healthy heart after you die, when a patient in the next room is dying because they cant find a suitable transplant.
In any case your desire to not donate your organs to help others can and will be respected.
Why is it only Americans who have these strange 'screw everyone else' tendencies and opinions which seem to fall apart at the slightest scrutiny?
Besides, what are you going to do with your body? It'll be gone sooner or later.
Not only that, but it's useless even for your family, since they can't simply sell it or profit in any way as they would with most things (unless you're also advocating for the family right to sell your organs).