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It is rare that all the ramifications can be forseen.

For example: 

DNA, the thinning of eggshells in certain species of birds (raptors) and decline in populations leading to possible extinction, banning DDT and subsequently over time an increase in malaria.

Welfare - we instituted welfare and for the first time erradicated serious poverty and starvation in the US particularly for children and elderly, unintended consequences - multigenerational welfare depended families.

Invasive species - introduction of species in habitats that have no natural controls and they take over (kudzu, snakehead fish).

Iraq - the idea that simply toppling Saddam would lead to victory but instead a host of unintended consequences resulted.

There's more, where a solution was sought for a very real problem in some cases, and the solution brought on new problems or maybe there wasn't a problem to solve but an objective with no long term thought to what might result.