That it was "an unfortunate event, and not at all the way God for planned to things to go" is not the teaching of the Mormon Church, as Mormons believe the Atonement happened precisely the way God willed it to happen and that it was perfect beyond our comprehension.
The official doctrinal stance of the LDS church on the death and resurrection of Jesus Christ is this:
The fundamental principles of our religion are the testimony of the
Apostles and Prophets, concerning Jesus Christ, that He died, was
buried, and rose again the third day, and ascended into heaven; and
all other things which pertain to our religion are only appendages to
As Mason Wheeler pointed out in the comment above, the symbolism of the cross and the doctrinal belief of the death and resurrection of Christ (the Atonement) are two separate things. While the Atonement is central to the LDS doctrine, the cross is generally avoided as it tends to remind us of the dead Christ rather than the living Christ.
It is not because the death of Christ was disgraceful, per-se, that Mormons do not use the cross. It is just not a symbol of worship the LDS church has chosen to endorse.
Yet I know many Mormons who have a cross in their home. Usually smallish, and only decorative. It has no religious significance and might have even simply been a gift from another Christian friend. I know of no occasion where there has been formal retribution for a Mormon having or wearing a cross, but it is true: you won't find them on or in LDS meetinghouses or temples.