the point to

[navi tasan]

Can one say:
1-The point to do that is to help others.
instead of:
1a-The point in doing that is to help others.

Can one say:
2-What is the point to do that?
instead of:
2a-What is the point in doing that?

[Harry Smith]

Can one say:
1-The point to do that is to help others.
instead of:
1a-The point in doing that is to help others.

Can one say:
2-What is the point to do that?
instead of:
2a-What is the point in doing that?

I think, yes.