Bad news travels faster, so bad marriages and domestic problems will always dominate headlines rather than people who have good and happy marriages.
A single person living in apartment block where he can hear the neighbors wife akichapwa kama burukenge can develop a completely pessimistic view of marriage from that single event.
Should we blame him or her for generalizing that marriage is a shitty deal? Of course not.
From a risk analysis perspective, it's the most rational attitude every thinking human being should have, when scary stories about marriage dominate the news cycle. Nobody has time for statistics when self preservation and human happiness is at stake.