Don't try to fool yourself by getting involved in a situation and saying "I'm just a dispassionate observer."
There has never been a human being created whose observations do not affect their psyche in some way.
Be prepared to be changed. The hotter the situation, the faster the change will make its mark on you.
Like a tuning fork, you will find yourself resonating with the emotional waves about you.
This means that you should be involved with helping others only if you are prepared to learn, and change with them.