Dear Ahmad,
Salam Alaykum.
If a person goes astray, he or she will still be responsible for this and will be punished because God told us not to follow anyone blindly and to verify everything before accepting as truth.
And as for the scholars, if anyone is led astray by the scholars with their un-Quranic doctrines, the scholars would deserve the double punishment for misleading to erroneous beliefs:
"Hence, on Resurrection Day they shall bear the full weight of their own burdens, as well as some of the burdens of those ignorant ones whom they have led astray: oh, how evil the load with which they shall be burdened!" (16:25)
Regards.