I kinda agree with you, but not totally. It is not about ignoring or even rejecting the truth, it is much more about shifting the focus. I can relate to the "former doomer" label and I can assure you there is no double-think involved. No denialism. For me, it is just recognition that I can't carry the whole world on my shoulders. My own life is heavy enough. So in order to save myself I have to let go of some worries, otherwise I break. In more detail here: https://marjankrebelj.medium.com/has-medium-doomerism-ruined-my-mental-health-f24f0c7a09b2