Sufyaan ath-Thowree said:

((It is befitting for a man to encourage his child in (seeking) knowledge, for certainly he is responsible for him))

Siyar A’laam an-Nubalaa. – Volume 7, Page 273

Ref: Fatwa-Online

Shaykh Saalih ibn Fowzaan al-Fowzaan said:

"It is an obligation to refute it, just as it is an obligation to refute the extremism of exceeding the limits in the religion. Rather, extremism in negligence and indulgence is more dangerous than the extremism of exceeding the limits in the religion,"

Ref: Extremism is in Lenience Just as it is in Harshness