Two phenomena are responsible “why gravity is all attraction toward earth?”:
1) The attraction gravity of Newton;
2) the “no-force” space-time gravity of Einstein.
The attraction gravity of Newton is the making of the Opposite Law and is manifested in all matters in the universe. All matters have opposite properties: north pole and south pole; protons and electrons , male and female, etc… The space-time gravity of Einstein is the skein of just the whole outer space, and such spacetime is simply making itself felt by effortlessly weighing, pressing all over such suspended earth, and other suspended bodies in the universe.
It appears strongly that both the attraction gravity of Newton and spacetime gravity of Einstein work together, inseparably.