accidents waiting to happen

an accident waiting to happen and a disaster waiting to happen (а thing or situation which is almost certain to eventually lead to an accident) — до добра не доведет; мина/ бомба замедленного действия; беды не оберешься; ~ как на пороховой бочке (...); ~ того и гляди, какая-н. беда приключится; жди беды; ~ чреватый (чревато неприятностями, тяжелыми последствиями); неминуемая катастрофа

Also, a train wreck waiting to happen (someone who is always about to get in trouble, always on the edge of disaster)

Example 1: Seriously, I think it's clear that John was an accident waiting to happen. He just managed to find a way to make it happen over and over.

Example 2: A child playing with matches is an accident waiting to happen .

Example 3: Crowdfunding: Potential Legal Disaster Waiting To Happen

ticking time bomb — бомба замедленного действия

Teacher who beat 'disruptive' pupil with dumbbell says after avoiding jail that many teachers are 'ticking time bombs' (dailymail.co.uk)

The term "accident waiting to happen" means that some unfortunate events must be accepted as inevitable.

cf.
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Комментарии

a (total) train wreck 1.

a (total) train wreck
1. патологический неудачник, тридцать три несчастья, ходячая катастрофа

..... My friend is a total train wreck (my friend is always getting into trouble, acting clumsily, making a mess of things.)

2. провал; (что-л.) никуда не годится

something that fails completely or goes extremely badly
..... The movie was a train wreck. (CALD)
..... After last year's train wreck of a season, we have to do better. (CALD)

.....