The phrase "are mostly ideological" is correct and usable in written English.
It can be used to describe beliefs, principles, or viewpoints that are primarily based on ideology rather than practical considerations.
Example: "The debates surrounding the policy changes are mostly ideological, reflecting deep-seated beliefs rather than empirical evidence."
Alternatives: "primarily based on ideology" or "largely ideological in nature".
Apple's opposition is mostly ideological.
The president and his tight inner circle were oblivious to the Republicans' explicit warning that he would not get the slightest cooperation from a party and a Congressional caucus driven by an implacable hatred of Mr. Obama that is mostly ideological but also fueled by his race.
LePage's opposition to Medicaid expansion is mostly ideological and, as governor, he's implemented or proposed a number of policies to actually limit the availability of Medicaid coverage and shrink the program's rolls.
Voters today are mostly non-ideological.
They, (including many lesbian, gay, bisexual and transgendered adherents) are mostly stuck at the stage of still arguing ideological positions.
In his online column this week, "Reflections of Comrade Fidel", the former leader accused the two ministers sacked by his brother of being seduced by "the honey of power".Tim Ashby, a former American official turned consultant on Cuba, says the new cabinet is mostly "non-ideological, pragmatic and results-oriented".
Political practice, Althusser maintained, was mostly motivated by ideological understandings of what the good is and how to accomplish it.
The austere Saudi version of Islam is mostly concerned with ideological purity -- rejecting versions of Islam that incorporate folk traditions or accord respect to human religious leaders, and instead celebrating only God, the Quran and saying of the Prophet.
Their institutional destination is mostly determined by the ideological climate and policy environment of the time.
When an ethnic group or a socio-political movement face persecution, it is mostly likely that their ideological brethren and brothers marshal their efforts, mobilize political troops to rise to the cause of the persecuted and the oppressed.
