Chaharshanbe Soori; why do the Zoroastrians abhor the Fire Festival?

Iranian Zoroastrians have unsuccessfully attempted to end its practice in Iran and stay away from its celebration.

Iranians and Armenians share this fire jumping festival. Armenians celebrate it in mid-February, called Trndez, now it’s observed as a Christian feast-Candlemas, celebrating the 40th day after the birth of Jesus.

Chaharshanbe Soori officially begins the longest new year celebration in the world; the Iranian Nowruz. But why do the Zoroastrians abhor this fire festival and have unsuccessfully attempted to end its practice in Iran?