I'm not gonna say anything mean about her, she/he has my sympathy. From what UGP has shown us, I'm sure the cat was hugely important in her/his life and the passing cut very, very deeply. Sincere condolences, UGP.
It has been over a year since my beloved Musica, who spent 25 years with me (and Mrs. FD) left. I still grieve for her.
But the ANGER of UP is a sign of some serious instability.
I pray for her to get through the stages of grief and get to acceptance.
This is one of the prices of faithlessness -- I am pretty sure I will see my beloved Musica (and her sister Neysa) on the "Rainbow Bridge" when I am done with whatever I am supposed to do here on Earth. That knowledge is unavailable to the UPs of the world -- for them, this is it and the end of someone is just that, the end.
But I also believe in a loving God that takes care of us even when we don't know Him. Someday UP will stand before God and, if she has done nothing worse that rant on a lefty board, she will know His love and forgiveness. And she will be led to the Rainbow Bridge for the reunion she can't see in her heart.