With the resurrection of the Jewish commonwealth and Israel's victories in it's subsequent wars with the Arabs, many orthodox Jews thought that the rebulding of the "Beis Hamikdosh" or "Holy Temple" would occur bringing in the "messianic redemption".
Many young Jews flocked to Israel to study, visit and work in Israel. One of the really big Jewish songs of the '60 and 70's, especially in the BT movement, was Rabbi Shlomo Carlebach's
"Yiboneh Hamikdosh" a song about rebuilding the temple.
But a really good question is, "what do these people really want?" Do they just want to play music, or do they also want to slaughter animals like in days of yore? After all these thousands of years does anyone have an opinion that will be made into a plan of action? It's find the TTO time again.