How conveniently you forget that India is the country where USA is most loved outside the USA.
I don't care about the world but the US has given me, personally, alsmost everything that I have in life today and I'm not alone. There are hundreds of thousands of Indians in India and in the US who owe so much to the US.
It's only natural.
Oh and BTW, as far as this particular case is concerned, the Pakistanis cannot cry hoarse because they have themselves blown apart all international conventions and practices.
They're setting a very bad precedent as far as international diplomacy is concerned. All thanks to their failed foreign office.
Also, India's experience with the US in the Headley case has been pretty satisfactory. We could never have hoped to get him extradited to India but the US has given our agencies unprecedented access to him. There are many things we've come to know about the modus operandi behind 26/11. All thanks to the access provided to Headley by the US.