The same reason as the Dragon was initially funded: options. The thinking is that only having one option is more risky than having two, and spending the extra m

The same reason as the Dragon was initially funded: options. The thinking is that only having one option is more risky than having two, and spending the extra money on the two programs is justified both by the enhancements that competition between teams brings, and by the lowering of risk to the program as a whole (if one does not work out, then we have a second one). And to counter the idea "the race is won, we don't need a second one", I will argue that we don't want this to end up like the Apollo program where we get there and then don't go back for 60 years.