Should we just test things on less cute animals?
You do realise that to use any animal in research you have to justify it and it is subject to rigorous review to ensure it's carried out as humanely as possible.
Researchers also have to justify exactly why they can not use a non living animal model instead such as cell lines. So if the experiments are carried out it is because they are necessary and potentially beneficial to human health.
But, ahhh, cute kittens.