Poor planning in a way, but considering that it probably wasn't an initial contigency that 2 Battlestars and 50K humans would be able to escape the overwhelming initial attack and then survive such a long distance. The RS was likely an emergency construction to chase the fleet into Deep Space since the Local Cylon soul recovery is likely done at a permanent on planet site.
Of course it could also be part of the "Plan" and it really isn't really necessary to the rescue of Dead Spylon souls from long distance and the destruction is only to give the Fleet a sense of false security.
Isn't it just a little suspicious that the Cylons wiped out the Caprican Human Base just hours before the Rescue party showed up?