This was a difficult case for them to "follow their heart" in because the lower court had given standing that was so egregiously out of place that it would mean

This was a difficult case for them to "follow their heart" in because the lower court had given standing that was so egregiously out of place that it would mean that standing would be given in similar cases having nothing to do with abortion. This could threaten some other sacred cows, and they never wanted that broad definition of standing in the first place. Some (e.g. the Strict Scrutiny podcast) have speculated that some cases are meant to make the SC look moderate, by giving them softballs to rule unanimously against the underlying ideological position they would normally uphold.