like a turkey voting for Christmas

Translations
действовать против своих интересов
Supporting that policy is like a turkey voting for Christmas.
Поддержка этой политики — это как индейка, голосующая за Рождество.
Definitions
This phrase is used to describe a situation where someone supports or endorses something that is clearly against their own best interests, often implying a lack of awareness or understanding of the consequences.
Words
like

preposition
как
a

article or possessive pronoun
один
turkey

noun
индейка
voting

verb
голосующая
for

preposition
за
Christmas

proper noun
Рождество