They likely think that it is old - fashioned or intolerant to insist on standards and principles. Many teachers and parents take a permissive approach and promote a “liberal ” way of thinking.
فَهُمْ يَظُنُّونَ أَنَّ ٱلْإِصْرَارَ عَلَى ٱلِٱلْتِزَامِ بِمَقَايِيسَ وَمَبَادِئَ مُعَيَّنَةٍ هُوَ أَمْرٌ عَتِيقُ ٱلطِّرَازِ وَيَدُلُّ عَلَى تَعَصُّبٍ وَتَزَمُّتٍ .‏