> We have marched, protested, voted and won. Human rights, gay rights, pollution and justice.
This is not true by any stretch. Human rights have been and are continually violated, esp. for minority groups, mainstream gay rights has become assimilationist and has abandoned the LBTQ of LGBTQ, and pollution abuses continue and many of those abuses moved overseas as perpetrating corps. went for cheaper labor.
> But it took effort and now the injustices are less obvious, are not next door but a long way away, and so it seems we can stop and rest.
The injustices are next door, they happen every day. The root causes of issues have not been addressed and classism, racism, sexism, and capitalist patriarchy are as much of a part of western society as ever.
> But injustice is like entropy - it never rests and so we let the torture be done in our name, we don't mind that the youth of the country are given sentences for looting longer than murderers, we don't shout that companies who leave their virtual doors unlocked should not be upset i they find people inside the building
It should be noted that people have tolerated and/or endorsed this kind of structural dysfunction for a long time and continue to do so. But you are right in that injustice is systemic and will continue even if people feel hopeless or tired of fighting that injustice.