Gabriel helps those who despise angels. all angels do. the same as they help those who ask for help.
They don't see those people evil. sometimes those that they help are just in that stage of growth. where they need to experience the dark and doubt to make it more clear later on.

to go without happiness makes you appreciate happiness that much more when it comes.

what was said in the bible? "Forgive them for they know not what they do"