Great change is rarely brought about with merely individual action. Is that actually true? Although I guess 'great', 'rarely', and what counts as individual a

Great change is rarely brought about with merely individual action. Is that actually true? Although I guess 'great', 'rarely', and what counts as individual action or not are so vague as to make that impossible to test. ...It just makes me feel I need do nothing. But I don't like that word 'merely', begging the question there.