Why did the anabaptist condemned?

Roman Catholic AnswerThe Anabaptists (the forerunners of today's Baptists) were protestant groups that appeared in Switzerland around 1521. Their principal tenets were:

1) the baptism of infants is unBiblical

2) only adults should be baptized as a sign of Christian belief

3) primitive Christianity should be restored, through the abolition of oaths, capital punishment, and the Magisterium.

4) a new kingdom of God on communitarian grounds should be founded.

These heretics were rejected by Catholics for denying the Church that Our Blessed Lord founded, and for denying His Bishops and priests: as He says in The Bible (Luke 10:16) "He who hears you, hears me; and he who rejects you, rejects me; and he who rejects me, rejects him who sent me." In other Words, they were rejected by Catholics for rejecting Our Blessed Lord.

Further, they rejected His Sacraments, that He established for the remission of sins, and the salvation of men. Particularly disturbing was their rejection of baptism - really altogether - as even their adult baptism rejects the very notion of a sacrament that really accomplishes what it symbolizes.

To reject the living Church, the very physical presence of Our Blessed Lord, and the Holy Spirit living in the Church is to leave the faith altogether, they had become heretics, rejecting their salvation. This is why they were rejected by Catholics.