It's ok to be sad. It's also okay to be angry.
“...anger could be thought of as an intermediate emotion. An event happens, the brain doesn't have time (or doesn't want to) to fully process the situation and it needs a reaction, so anger is what's used until there's more time to examine everything in more detail.”^
“It’s the one that tells us we need to take action to put something right,” she says. “Anger is a problem-solving emotion. It gives us strength and energy, and motivates us to act.”^
“Nobody ever gets into trouble for feeling angry. But people sometimes get into trouble for what they do when they feel angry.”^