If there's no more bad luck for HAM and VET, i.e., they finish P1/P2 or P2/P1 in the remaining five races, then VET can be champion only if he wins all 5 races.
If VET gets P2 in just one race, with HAM P1, then HAM can finish the other four in P3 and still be champion. In other words, RAI in P2 won't be of any help to VET.
If HAM wins 2 more races, then he can afford a DNF, P3, and P4 for the remaining 3 races and still be champion. Or, with 2 wins he can afford P5, P5, P6 for the remaining 3 races.
Long story short, VET needs a lot of help from HAM if he doesn't win all five remaining races.