Have to ask....

First, this is my favorite movie of all time and don't mean this as a critique. But I do have one question I can't answer myself.

The decision was made to alter course in order to potentially acquire the bomb on Icarus 1. I get the "two is better than one" argument and can totally buy it as a device to move the film where it needs to go. But why did they decide to rendezvous with the Icarus 1 on the way to the sun? Why not drop their own bomb and, if unsuccessful, retrieve Icarus 1 and try again?

It is mentioned Icarus 1 "almost made it," so I imagine reserves of fuel, food etc. wouldn't be an issue. Even if it were, if they knew the first bomb failed, then they're going home to nothing anyhow and they might as well go for the other bomb regardless of resources for a trip home.

In my mind, the return trip could easily deviate it's course so...why???

Much love.