The phrase "are just assumed to be" is correct and usable in written English.
It can be used when discussing beliefs or perceptions that are taken for granted without questioning.
Example: "In many cultures, certain roles are just assumed to be filled by specific genders."
Alternatives: "are simply regarded as" or "are merely considered to be".
The Raiders, the Oakland Raiders, have made it to that rarefied place, usually only occupied by Bill Belichick and the Patriots, where decisions they make are just assumed to be intelligent.
The maximum positive and negative deviations are also determined from the same data set; however, those for the upper haze layers are just assumed to be 50%.
Early socialization is seen as socialization into a specific culture, and very often that culture is just assumed to be a national one.
Free will becomes the legitimating excuse that is used to ignore the plight of the most unfortunate, as the world is not now examined to see if it is just but instead is simply assumed to be just.
Although the idea of urban farming might be unknown to many people or just assumed to be commonplace in coastal areas such as San Francisco and Brooklyn, Detroit is becoming more about potatoes than pistons.
Anxiety disorders are underdiagnosed in the elderly, largely because the symptoms are often assumed to be just another manifestation of aging.
There was a time when diagnoses weren't rampant, and kids being kids, it was just assumed they're going to be rambunctious.
"Look, prostitutes are just seen as unrapeable, they're always assumed to be sexually available," he finally said.
Our moral judgments and resulting behaviors cannot just be assumed to be mere causal upshots of some such biological and psychological forces, on a par with the cooperative activity of bees or the resentment felt by capuchin monkeys over unequal rewards for equal work.
They came loaded to carve up the Americans, who, it was just assumed, had to be stupid because they represented the Bush administration.
Le Pen, the father, was speaking as the National Front's candidate in local elections in southern France — he was, in fact, favored to win there — and Marine (as everyone in France refers to the daughter), who is not just the party president but is assumed to be preparing a run for President of the Republic, in 2017, responded by opposing his candidacy.
