Misguided RCWP.

A group going by the name Roman Catholic Womenpriests has "ordained" 3 women "priests" and 1 woman as deacon in a ceremony held at Church of the Covenant, a Presbyterian Church (USA) in Boston MA this past Sunday.
This "ordination" was carried out in spite of a Vatican decree that says women's ordination incurs automatic excommunication.
On the groups web site, they state;
"Roman Catholic Womenpriests reject the penalty of excommunication issued by the Vatican Congregation for the Doctrine of Faith on May 29, 2008 stating that the 'women priests and the bishops who ordain them would be excommunicated latae sententiae.'”
A press release from the Archdiocese of Boston states, very clearly;
"The organization calling itself 'Roman Catholic Womenpriests' is not recognized as an entity of the Catholic Church. Catholics who attempt to confer a sacred order on a woman, and the women who attempt to receive a sacred order, are by their own actions separating themselves from the Church."
It's very telling that the group could not have the "ordination" at a Catholic Church.....but had to use a Presbyterian Church.
I don't understand why a Church would wish to interfere with the internal workings of a different denomination. Frankly, the Presbyterians should mind their own business.
I don't understand the "logic" of the Roman Catholic Womenpriests (RCWP) group.
Why would anyone choose the Catholic Church over another denomination?
It seems to me that the reason to choose one Christian church over another is because that Church is the true Church of Jesus Christ and as such, is guided by the Holy Spirit.
Obviously, the RCWP believes that the Catholic Church is in error in it's decision to prohibit the ordination of women. If the Church is in error, then it cannot be guided by the Holy Spirit. If it isn't guided by the Holy Spirit, then why remain in the Catholic Church?
It sounds to me as if RCWP is just another group of misguided individuals who want the Church to conform to their views.