"If nothing that we do matters, then all that matters is what we do." Opinions?

EDIT: Now that the answers stopped rolling in, I think a little observation is in order. And in all honesty, I must admit I am shocked and amazed at the number of people who focused all of their attention to the first half of the statement, and failed to notice that the true emphasis was placed on the other half. Another thing that was equally shocking and surprising was the number of people who overlooked the initial "if", and interpreted the statement as if it stared with a "because".
In essence, all of you who said that it did matter (even though you missed the point) were right - it does matter. But the true meaning of the statement is also true - "all that matters is what we do", i.e. doing good needs no meaning other than doing good itself. Thank you for your time.