It's your own fault for being careless.

你粗心大意是你自己的过失。

《牛津词典》

You should not blame others for what is your own fault.

自己做错了，不能赖别人。

《新英汉大辞典》

It is in part your own fault.

你在某种程度上是你自己的错误。

youdao

By contrast, almost no one could afford outright the medical bills of a serious hit-and-run car accident, or a long-term illness brought about through no fault of your own.

FORBES: Confusing Health Insurance With Health Care Is Bankrupting Us