- R may have suggested that the wee chinchillas are not a suitable topic;
- 5M had several rough experiences with previous pets and perhaps suspected that unkind commenters would leave nasty remarks or speculations on her reasons for even having chinchillas; or
- that others would make satirical cartoon series about them.
Those are my guesses.
I wish her well with them.
I understand that chinchillas aren't the easiest pets to care for, but I'm sure she's up to the challenge.