My only experience of a Yachad visit was being shown round the Hebron hills by a spokesman for "Breaking the silence" and being told lies by that spokesman. Those lies (for instance completely denying PA incitement that can be seem by anybody at the Palestinian Media Watch web site, and giving a false narrative for the sites that we were being shown) appeared designed to build up anger against Israel by the participants. It is certainly a lie to call Yachad pro Israel.
U.S. envoy to UN visits Cuba's UN Mission, a first in decades (AP)
from the article: When Diaspora Jews visit a West Bank court