The phrase "are not decent" is correct and usable in written English.
It can be used to describe something or someone that lacks propriety, morality, or respectability.
Example: "The comments made during the meeting are not decent and should be addressed immediately."
Alternatives: "are inappropriate" or "are unseemly".
Given that the abuses show precisely that some soldiers are not decent fellows, and given that in the court-martial it has been disclosed that the abusers' quarter master gave an order capable of being interpreted as a licence for violence, such a reaction is not good enough.
Since you are not decent, I can even scold you without a qualm.
All groups have members, including groups that are not decent, fair, or morally praiseworthy; but if membership is sufficient to generate an obligation to obey, then the members of unjust and exploitative groups will have an obligation to obey the rules.
"These aren't decent, thinking people.
The problem isn't that they aren't decent enough, though we could all amp up our decency without hurting anyone's feelings.
"If the decent ones really aren't decent... if [racist] language translates to racial oppression... then this city, these communities, are totally screwed for a long time coming," he concluded bluntly.
They said it was "not decent" for a Socialist soldier to have a capitalist girl friend.
Greenhalgh has declared that this estate is "not decent", and has offered it for sale to property developers.
My mum says, 'Oh, no, they're low class — they're not decent people.' But I like them".
"The girls who were detained were not decent girls like your daughter or my daughter," one senior general told a CNN reporter, and asserted that not all of them had been virgins.
A hairdresser says she is proving people in Egypt who think a woman who works as a hairdresser is not decent wrong.
