Sometimes their emotions have gone so far past reasonable that the first thing you need to do is bring them back to the point you can actually reason with them. After that, yes it’s really vital to take their emotions seriously, they need to understand them and trust that the people around them will take them seriously, but they also haven’t yet built the skills to moderate their own feelings, so sometimes you need to add those externally.
Sometimes their emotions have gone so far past reasonable that the first thing you need to do is bring them back to the point you can actually reason with them. After that, yes it’s really vital to take their emotions seriously, they need to understand them and trust that the people around them will take them seriously, but they also haven’t yet built the skills to moderate their own feelings, so sometimes you need to add those externally.