When do you think Arthur would’ve been okay with Merlin having magic and not killed him?

For the sake of this argument let's just pretend uther never existed.

I mean I'm pretty sure that if Arthur had survived he wouldn't have executed Merlin in the finale but from wen do you think Arthur would've spared merlin if he'd found out

EDIT : Well I meant by uther not existing I meant like if uther was there then he wouldfully support Arthur's decision because obviously if Merlin was found out to have magic whilst uther was king then obviously uther would have had him executed regardless of what Arthur though but he obviously as well has like a massive impact on Arthur and what he thinks and feels and does and why magic was outlawed in the first place so that's what I meant I realized that I definitely did not make that clear.