The elders are perfectly aware that life must exist. The issue they have is with intelligent life existing. And since intelligence is but one possible outcome of the evolutionary process, the elders desire evidence that the presence of intelligent life is a net benefit for them.
Considering this dialogue from Heart of Stone that appears if you have runestones in your inventroy:
Wenkra: Her. Wen. One of the creators. The unmaker. Wait. I sense a trace of her power in you. You wield it bound in tiny stones. How dare you! How dare you claim to wield a fraction of her might and to name it so trivially! Your mind names it 'magic'. A word that in no way reflects the power you seek to emulate. Such power is not for TokHaar, nor any other living imperfection.
...
Your opinion is irrelevant, only They can decide. Your frivolous use of magic endangers the Great Task. You and your kind should cease immediately.
----
The very use of magic (of which intelligent life is very capable) places the Great Revision and, by extension, the elders themselves in danger, which is a big tick against the perpetuation of intelligent life.
Furthermore, it is also important to note that Zaros's initial belief that Mah was stillborn due to insufficient anima no longer appears to be true. From Children of Mah:
Seren: Mah, I see it now; that icy corruption torn into your core. You are like this because someone close to you willed it... There is only one way I can help you, I am just so sorry it has taken me this long to realise.
This indicates that Wen was likely responsible for Mah's stillbirth.
Furthermore given the existence of the Dragonkin from the previous revision and knowing that Mah was meant to prevent mortal life, we can conclude that Mah was corrupted at some point during the previous revision with Wen either corrupting her after Mah displayed traits out of the ordinary (I believe the example Jagex gave was making butterflies) or caused her to act out of the ordinary.
22-Apr-2017 20:14:38