It's understandable that, as a parent, Angel would be mad, as in snarling, clawing, snapping, furious at Wes for endangering Connor's life, regardless of the very best of intentions, and I can completely agree with his initial actions in this case. I do find it more than a little bit ironic, however, that Angel would act the way that he did, considering that Wes was acting, as far as he knew, with the greater, ultimate good in mind, in not discussing his fears and beliefs with someone else before acting. This is the very thing that Angel himself has done time and again, making decisions that affect the very lives of others without so much as giving them the courtesy of knowing what he was about to do or had done. That's why I see so much poetic justice in Season 5, when his plan to erase Connor's memory from all of the others came around and bit him squarely in the ass.
Just as a side thought, how were a couple of human hospital orderlies able to restrain a quite obviously furious super powerful vampire? Do the hospitals in LA hire their own super powerful demons for just such emergencies? That would make an interesting story. Vampires as working stiffs, working, not for peanuts, but for blood.