Answer:
Slippery-slope
Step-by-step explanation:
This is most consistent with the idea of a slippery slope. When we refer to a slippery slope, we refer to a decision that, if taken repeatedly, can become problematic, even though the action might not be undesirable if only repeated once. When there is a danger of a slippery slope, it is usually better not to take the action in the first place, so that we can eliminate the risk of repeating it in the future.