Alarmism

Alarmism is excessive or exaggerated alarm of a real or imagined threat. Alarmism connotes attempts to excite fears or giving warnings of great danger in a manner that is amplified, overemphasized or unwarranted. In the news media, alarmism can often be found in the form of yellow journalism where reports sensationalise a story to exaggerate small risks.

Alarmist personality
The alarmist person is subject to the cognitive distortion of catastrophizing – of always expecting the worst of possible futures.

They may also be seeking to preserve feelings of omnipotence by trying to generate anxiety, apprehension and concern in others.