0

Something like, someone is trying hard to justify something evil.

-1

One idiom is about a silver lining in a cloud. Such as:
"Every Cloud has a Silver Lining."
or
"I'm just looking for the Silver Lining."

EDIT
Based on OPs comment: "Can I use this in a criticizing way?"
You can use it for criticism, but it has a different form, which varies based upon emotional state. Such as:
Polite: "You are looking for a silver lining where there isn't one?"
Angry: "You're wasting your/everyone's time searching for an imaginary silver lining. (sigh)"
Vulgar: "You're searching for a silver lining inside a turd!"

2
  • Thanks, can I use this as to criticising way, as in "you are searching for the Sliver Lining in the earthquake that ruined the city"?
    – AryanDs
    Dec 23 '20 at 5:38
  • Edited my answer to address your comment.
    – Scottie H
    Dec 23 '20 at 6:00
1

I think “grasping at straws” could work well here, it means

trying to find some way to succeed when nothing you choose is likely to work

and

trying to find a reason to feel hopeful in a bad situation:

While neither of these quite captures “desperately” from you question, it depends on where you get the explanation from as dictionary.com does actually use desperate in theirs:

Make a desperate attempt at saving oneself

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