People eat meat and love animals. Veganism is perfectly healthy and doesn't require killing creatures just as intelligent and loving as their dogs and cats in order to have adequate and delicious nutrition.
If you disagree passionately with the above statement, like it gives you real feelings of frustration, congratulations, you are experiencing cognitive dissonance.
Lesbian parents have been around for a long time. Some men can be pregnant and give birth. But I assume you mean the issue being that they'd be alone, not the lack of a male parent. Being a single parent when you weren't expecting to is hard. But of you're prepared and equipped for it, go nuts. IVF is given to awful married parents. The parents' aptitide isn't a factor for couples, why should a standard suddenly exist for single people?