If you study the magisterial Protestants, especially Luther, Zwingli, and Calvin you will find a mean and controlling bunch of men. After Calvin toasted Servetus he said...
"Whoever shall maintain that wrong is done to heretics and blasphemers in punishing them makes himself an accomplice in their crime and guilty as they are. There is no question here of man's authority; it is God who speaks, and clear it is what law he will have kept in the church, even to the end of the world. Wherefore does he demand of us a so extreme severity, if not to show us that due honor is not paid him, so long as we set not his service above every human consideration, so that we spare not kin, nor blood of any, and forget all humanity when the matter is to combat for His glory." - John Calvin, after the death of Michael Servetus
"Pure devilry is urging on the peasants
. Therefore let all who are able, mow them down, slaughter and stab them, openly or in secret, and remember that there is nothing more poisonous, noxious and utterly devilish than a rebel. You must kill him as you would a mad dog
" -Martin Luther
Huldrych Zwingli, after Luther and Calvin, was often time referred to as the "Third Man of the Reformation" and just as ruthless. By 1525, adults in Zurich were being baptised in rivers. This was bitterly opposed by Zwingli and Zwingli agreed that Anabaptists should be drowned in a decree of 1526. This destroyed the group and they survived in a few isolated areas of Switzerland or moved to other areas
I believe the magisterial protestants, such as we had in Luther, Zwingli, and Calvin, were all your Sardisean church age variety Christian, and had no use for the Anabaptist.