Individual or Structure?

Kurt Lewin seems to assume that individuals' behaviour cannot be analysed in isolation from groups to which individuals belong. This might be true because it is almost impossible for us to consider any individual living without any interaction with other people than her-/himself.
However, does it mean that individuals are not responsible for how she/he organises her/his behaviour???

What Lewin, or philosophy of OD, implies may be that we should not pursue ultimate responsibility within individuals' attributes, rather seek to identify and establish structures or institutions which lead individuals to as much psychosocially fulfilled situation as possible.

However, both empirical evidence and theories seem to have shown that our daily lives are filled with situations sacrificing individuals' satisfaction for oraganisational benefits as well as very humanistically managed situations.

I cannot but concluding (only temporarily) that this is the modern world in which we live.
We have to make decision and take actions even though we are not so sure whether it is right or wrong. (Another question is "what the right thing, or the wrong thing, should be?")
What we should be aware of is that results derived from those decisions and actions tend to sustain (not disappear instantly). In order not to inclined too much to organisational benefits, it would be critical to think of to what extent constituent individuals are psychosocially fulfilled.