From an european POV I'd guess it has to do with fire-at-will and litigation-happy culture combined with scant labor protections for white-collar positions & low union participation. Maybe people are reluctant to raise issues until it's blatant enough that they can win a court case if they are shrugged off and fired by the employer?

In many north european countries you could take these up as a workplace bullying issue and possibly escalate to your municipal workplace safety ombudsman and/or union rep. But in most cases you wouldn't have to, your grievances would be taken seriously internally because there's the threat of escalation that won't necessarily end with the victim leaving the company.