If obligatory abstention from marital sexual union is virtuous then yes they were virtuous. But for a sola-scriptura group they were definitely anti-Scripture on this one, least it is difficult to see how one should ‘go forth and multiply’ if celibacy within the marital union is the expected norm!
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It is universally accepted that to kill is wrong. The CC is particularly emphatic about this, hence such staunch defence of the unborn…
It is hardly surprising they angered the Pope when they taught that it was wrong for husband and wife to have marital sex.
But of greater depravity was their teachings that suicide was an ideal to aspire to, particularly encouraging parents to kill their children before killing themselves.

Small wonder the Pope was angry at such obscenty…
It is interesting Cats and Dogs says 'there was no heresy to the Sciptures. Where in Sacred Scripture is it taught that ritual suicide is an ideal to aspire to? Where is it taught that parents should win God’s favour by performing human sacrifices?
I suggest that much of the demise of this group had more to do with them wiping themselves out as any act by an outside force.
A group which encourages simple folk to kill their children and then kill themselves is sick perverse and warped. Small wonder the CC acted and acted swiftly. It would not be the CC that I know love an cherish had it acted any differently.