berlin emphasis place holocaust integration course migrants germany justice minister say reflect heighten unease among lead politicians spate anti-semitic act include israeli flag burn million migrants arrive germany last three years many flee conflict middle east cause concern anti-semitism could increase german police report protesters set israeli flag ablaze use anti-semitic slogans berlin cities demonstrations u.s. president donald trump decision recognize jerusalem israel capital piece weekly magazine spiegel justice minister heiko maas write holocaust nazis kill six million jews significance need become even important part integration course migrants test examination end course lessons holocaust need one guide ideas lessons chapter german history say racism place germany everyone want stay germany long term need clear fight neonazis anti-semitism tolerate import anti-semitism immigrants either maas add jens spahn senior member chancellor angela merkel christian democrats cdu tell spiegel think immigration muslim countries one cause recent anti-semitic demonstrations berlin spahn say incidents recent days relate immigration culture people prissy deal jews homosexuals speak event mark 70th anniversary establishment israel german president frank-walter steinmeier say friday germany need remember historical responsibility include lessons two world war holocaust ensure israel security reject form racism anti-semitism end responsibility people bear afterwards exceptions immigrants say add burn israeli flag understand respect mean german interview funke newspaper consortium israel ambassador berlin jeremy issacharoff call ban burn flag anyone burn flag question israel right exist say stephan kramer head state intelligence agency eastern region thuringia warn spiegel anti-semitism become ever uninhibited many jews scar identify holocaust must big part migrant course german minister