That's entirely the problem.
'We' are told 'They' have problems with 'Us' and 'We' should be in fear of 'Them' rising up.
'They' are told 'We' have a problem with 'Them' and 'They' should be in fear of 'Us' coming after 'Them'.
While that is entirely simplistic, and I'm ignoring real issues, I believe if 'Us' and 'Them' got together without anyone fuelling the fires, 'Them and Us' would become 'Just Us' and that's what 'Those in Power' don't want.
Divided we fall.