I see what I think are two elements of the evil report
I. IT WAS THEIR OPINION
Numbers 13:31-32 (KJV)

It’s all opinion, there is no proof of it and
It’s all negative

II. IT DID NOT TAKE GOD IN ACCOUNT
Numbers 13:28-29 (KJV)

Twelve men went to spy out Canaan.
Ten came back to discourage the heart of the children of Israel
III. TWO RETURNED TO ENCOURAGE THE HEART OF ISRAEL
Numbers 13:30 (KJV)

Numbers 14:6-9 (KJV)

A. They put God in the equation
Vs 8

Vs 9

B. They reminded them that it was an exceeding good land
Vs 7

C. They urged them not to rebel against the Lord
Vs 9

D. They urged them to take immediate action
Numbers 13:30 (KJV)