I agree with you.
Why can’t the rangers put the calf under human care since it is the natural habit of the mommy to abandon it?
humans still can bottle feed the calf.
It is cruel to put the calf to death since it is innocent and still a baby.
It is utterly unfair to the poor animal.
As for the visitor, I am sure that he had a deep regret for trying to be kind to the calf.
In addition, the rangers should put up a sign everywhere that visitors are not allowed to touch these wild animals, maybe put up a row of barb wires or something !

rest in peace calfy !

I think that was such a cruel act. The calf should have been taken in instead.

What could they bd thinking? Arent they suppose to guard and protect?

I think they should bring the calf to a zoo.
At least the calf will have experienced caretaker for it.
I can understand that the rangers are not qualified and do not have the resources to look after a young calf, though I cannot understand why they do not ask the zoo to help out.

Bison display five apparent defense strategies in protecting calves from wolves: running to a cow, running to a herd, running to the nearest bull, running in the front or center of a stampeding herd, and entering water bodies such as lakes or rivers.

Last night I read in an old book that zoo animals attack the visitors mercilessly if someone goes near the animal teasing the animal with fingers or taking them food.

Australian tourist Kathryn Warburton got far more than she bargained for when she scaled two safety fences to get a photo of Binky, a 1,200lb polar bear. The bear promptly stuck his head through the bars of the cage, seizing her. Warburton’s leg was broken and she suffered lacerations.

She might have been killed outright if not for quick thinking zoo visitors who thrashed Binky with branches, causing him to relinquish his hold. Only a month and a half later, the bear mauled another tourist, a drunk teenager whose leg was torn up. Despite the attacks, Binky became a minor celebrity, his face adorning zoo merchandise.

I salute you for being a single parent, bringing up your kids single handedly.
It is not easy to stay positive all the time but you did it well.
Telling yourself that everything will be alright, it is not your fault for what had happened, is a miracle.

However, with friends and family members to support you not financially but emotionally, I am sure you will find the right company that keep you going.