Does properly finished and sealed granite really present such a big threat?
Can you cite some studies?
I understand if someone had unfinished (porous) granite, it would be very hard to disinfect. But new, professionally installed granite countertops (at least those I've seen) are polished and sealed to a mirror shine.
What should people get instead of granite? I have Formica and with wear it's getting rough areas which naturally trap germs. Tile usually has grout seams, and open grout is extremely porous (think mildew in shower tile). Butcher block or any other wood is out because it definitely is hard to totally sanitize, and the more you use it, the more little scratches appear to trap germs. Corian is softer than granite, so over time it too can be scratched. Any of these will be safer with proper care, regular cleaning, and maintenance.
A professional kitchen usually has nothing but pro-quality stainless steel counters, but not many people want their own kitchen covered in stainless. So what is left to use?