The phrase "are often distrustful" is correct and usable in written English.
It can be used to describe a tendency or common behavior of a group or individuals who have a lack of trust in others.
Example: "People who have been betrayed in the past are often distrustful of new relationships."
Alternatives: "tend to be suspicious" or "frequently lack trust".
At the same time, they are often distrustful of ideas suggested outside their organisations.
Mr. Marcus may have a hard time convincing investigators of his account, because he is offering to testify on behalf of someone he served time with in prison, and prosecutors are often distrustful of such testimony.
Vietnam-era veterans, in particular, are often distrustful of the VA -- a legacy of that generation's suspicion and anger at the government -- and many have never sought VA health care.
In fact, it's hard to see his new oratorical coda as anything other than a dog whistle to his base and specifically white, evangelical Christians, who are often distrustful of other religious groups.
For young Latinos who are often distrustful of politicians and the two dominant parties, the immigrant rights movement has played an influential role, often allying itself with other progressive, identity-based social movements like Black Lives Matter and LGBT rights groups.
Communities who historically have had the greatest risk of poor health outcomes and early death are often the most distrustful of the medical system -- often with good reason.
Victims are often ashamed, conflicted about their pimps, distrustful of people who want to help them, and not at all likely to admit that they have been trafficked.
That world is often angry, distrustful and opinionated.
Morrison has always dabbled in magical realism; even if she has been distrustful of the term, fearing it detracts from the politics of her work, these supernatural elements are often central to her stories.
They drew from working class locales, were often poor and distrustful of outsiders.
At its fundamental core, the campaign is tasked with building goodwill behind a figure who is often culturally portrayed as distrustful, ambitious, and morally ambiguous; this mission is fundamentally in the DNA of a Premium Drama landscape defined by complex antiheroes.
