Why don't ALL twin/quad prop engines turn in opposite direction (to kill the lateral drift)?

Probably expensive to produce a counter rotation engine and prop. Considered unnecessary anyway. I image an opposite pitch propeller would help a bit. Or contra rotating props which some planes have. Antonov An-22 being one example.

The famous twin-engine Lockheed P-38 Lightning of WWII used opposing engine rotation (the LH and RH Allison engines had individual identities.)

You already picked a best answer, but, imagine needing 12 spare engines for your C-130 fleet. Now, you would need at least a 50% increase in spares. You can't just say I only need 6 of each. What if 5 of one type failed? It'a a logistic nightmare, and isn't needed. The C-130 has been flying since the '50's with no problem.

Because it's just as easy to ''trim'' the aircraft to fly properly without the expense of contra-rotating engines and props.

Spare parts, with opposite turning engines you need two of many critical parts, which are expensive to produce  and maintain.  The P-38 Lightning fighter originally had counterrotating props, it got to be a nightmare maintaining them in the field so they started putting standard engines on both sides.