Why do Catholics portray Jesus on the Cross?

On the Crosses in Parishes, Cathedrals, Rosaries, and any other place that there is a Catholic image of a Cross, you will find Jesus on the cross. But this is not true for Eastern Orthodox or Protestant groups. Why is this? Related: https://christianity.stackexchange.com/questions/5476/why-the-difference-in-depiction-of-the-cross-between-catholics-and-protestants