Nope. Certain types of cancer screening are helpful in making people live longer and healthier. It is much easier to treat cancer when it is caught early.
Absolutely, but 5 survival rates are still a really bad metric because they make things look better even for uncurable cancer (or cancer that was curable but treatment was given up on because of price). Also, if a 90 year old gets a slow growing cancer that doesn't require treatment (cause they'll be dead before it's a problem), screening for it will increase survival rates even though you didn't actually treat anything.