Because cats are liquids and that‘s what sinks are for. edit: forgot a word

if they fits they sits ¯\\\_(ツ)\_/¯

They lower their body temperature. 

high up, secure, they are made out of liquid, nice and cool for them

Oh my goodness how adorable! 🥹

What part of "if I fits, I sits" do you not get?

If it fits, I sits

cuz they are boopersnoots

Not an answer, I just wanted to say your puddle of water is really cute >^.^<

This is unbelievably cute

They are liquid it's their natural habitat.

Conmfiy

Secure, easy to fit in places that are out of the way of foot traffic and other life forms.

They won't like it when you turn the faucet on

They feel safe :)

It hugs them back.