The Battle of Britain was the last group goodness at a large scale

Evil is specific, but Goodness is affiliation with God's creative purpose, a positive affiliation rooted in love. 

When a group is good, the members need to share this positive motive and also be affiliated with each other. 

Love of God and neighbour, in other words.

For some months, this was the situation in Britain, in 1940; which is why the memory fascinates and is cherished by us, here.

And because of these special circumstances, "good magic" was possible and effective, for a while: national prayer, a daily silence, many and various forms of communal ritual magic (some explicit, mostly tacit).

This situation was not long-lasting, however; and has not recurred.

Evil is specific, and works by validating and strengthening particular sins. In the later parts of WWII, several sins were thus expanded: including vengeance, sadism, spite...

And group Goodness was replaced by double-negation: by opposition to "bad things" - and so it remains.

Nowadays people can only conceptualize "good" as a kind of therapy; the attempted palliation or cure of sickness, poverty, war, or some (real or supposed) injustice. 

Goodness has become almost impossible at the large-group level; while evil has an easy time of it! 

And those who yearn for goodness have discovered that it cannot be imposed top-down nor via a minority: group activities (prayer, meditation, rituals) don't work for Good; they are ineffectual because the group is not positively affiliated to God's creative purpose.

Group activities still work for evil, however - by increasing particular sins - as we see all around us.

Group-goodness is, was, a kind of mass effect of many individuals; it was real - but continued only to the extent that this was true.