trad123 - St. Thomas is stating clearly that is not the gravest of all sins. Clearly, unambiguously.
If sacrilege were by its nature worse than sins against nature adultery would be worse than unnatural vice, but it's not.
Someone who says that unintentional stepping on particles of the sacrament is worse than abortion is simply a lunatic who is driving people away from the Faith.
If the SSPX wants to cultivate cult-like lunacy that is opposed to St. Thomas and Catholic teachings, they can continue to refuse to correct such positions.
If on the other hand they are serious about Catholic teaching then they will PROVE their statements, prove that a sacrilegious communion is regarded as being worse than murder, instead of resorting to dirty insults, mischaracterizations, idle boasts, etc.