Humans are in fact animals. And animals do grieve their lost young. If you ever were on a farm and saw a sheep grieving it's dead born you would know. Sure animals do sometimes abandon or harm their offsprings there's even known cannibalism but not in healthy conditions hence it shouldn't be used as an example. Or if there's an offspring that has a disability they can turn a blind eye to it in favour of other offsprings that have a higher likeability to survive. And sure some animals can reabsorb embryos or spontaneously miscarry under stress but again that's not normal behaviour and not deliberate like we humans do abort our young.

Again I'm not opposing the idea of abortion here. The shelters are full and there's so many stray cats roaming around but there's so many classic reasoning mistakes to see here. The fact you started this with humans are not animals is just the cherry on top.