Shaykh Salih Al-Fawzan حفظه الله said:
One must take care of girls. Their guardians must look after, monitor and keep an eye on them. Because they face a greater danger. Especially in this time where free-mixing is widespread; mixing between people; girls, boys. Free-mixing is widespread. So the Fitnah is greater and more vigilance is required. So, the girls guardians must be strict over them, keep an eye on them and hold them in check. Because they are a trust which rests on their shoulders and a girl becoming corrupt is something which tarnishes the entire family. It tarnishes the family and the entire household and the girl becomes someone worthless in society. It is death! A death greater than the death which brings end to life . It is death of one’s honour and shame and death of one’s religion and morality. So it’s necessary for the girl’s guardian to seek Allah’s help, remain patient and monitor her up until he hands her over to her husband. If he is approached by someone with whose religion and character he is pleased with, he should hand her over to him in marriage. In which case, he(the husband) becomes responsible over her. “Men are the caretakers of women,” [An-Nisa 34] “Protect yourselves and your families from a Fire whose fuel is people and stones,” [At-Tahreem 6]
Source: https://youtu.be/P0_vSm63bsw