The ends justify the means?
Really?
Consider Magneto. His end goal is to create world where mutants are safe and can live at peace. His means are to erradicate all non-mutants.
Consider Big Brother from 1984. The end goal is to create a stable world order, free from chaos. The means is to control the lives of every human on the planet.
Consider the Borg from Star Trek. Their end goal is to reach the height of technological and biological life. Their means is to assimilate anything and everything different than themselves.
No, the ends do not justify the means. Indeed, improper means can only lead to an improper end.
Consider, at the end of CC, what Schala tells us:
The '"eggs"' that we call planets...
And the innumerable '"spermatozoa"'
which gather around these
that we call life-forms...
When one of those countless seeds
inseminates a planet,
a new universe is born.
But until that occurs,
hundreds of millions of years will pass,
and innumerable life-forms will be born,
then die...
That is the be-all and end-all.
Everything exists for that one moment.
All so that the universe can evolve
into the next dimension...
The TD was evolving into the next dimension (admittedly, a dimension in which it could consume the old, like a new born plant consuming the seed it was contained in for food). It was the "be-all and end-all" of everything. All of existence had led up to that one point. And Belthasar stopped it.