oh man I have a lot of feelings about c!phil (although I haven't seen much of his streams, so please correct me on things I get wrong)
honestly his motives r valid, however his execution of the plans and his interactions with like. every character except techno and possibly ranboo r pretty harsh.
he didn't save friend for ghostbur despite promising to take care of him - and it was a very quick thing that he admitted to knowing about. and they had a long while to prepare for destroying l'manburg, so he wasn't exactly short on time. he treated fundy, his canonical grandson, like shit (again i only have secondhand knowledge of this so correct me if I'm wrong) and also he and techno teamed with dream despite knowing that he had hurt/abused tommy in some way. as far as I am aware he also mainly blames tubbo, as the ex-president of l'manburg? even though in fact most of the problems with the actual government stemmed from his the cabinet (quackity, and fundy to a lesser extent). he also took immense pleasure in the distress of everyone trying to stop the explosions - who were not actually the people in the government (except for tubbo and maybe quackity? I'm not sure about him though). most of them weren't even citizens of l'manburg. then he told ghostbur it was all about sending a message against government, so he clearly hadn't taken into account that for a lot of people l'manburg was the community - for tommy, for example. he treats a lot of people with a cold indifference, for example the way he spoke to eret outside techno's house.
c!phil only really sees things (and most people) as having no sentimental value - which is fine, but then he doesn't respect that others may have attachments to people and things, and destroys or damages them without a thought as to how that can emotionally hurt someone. which he should really think about, since his main reason for destroying l'manburg was because how they had treated techno, who he cares about a lot.
he gets angry and upset his friend was hurt, then turns around and hurts everyone else without thinking - or caring - about it. c!phil is a pretty good character, but he isn't that great a person.