Most "crusades" we puny humans start out on DO end up as just a job. However, I worked for FIFTY years and ONLY lost enthusiasm in that 50th year. My "Crusade" had reached its end. It does happen, finally. But, then I wasn't in the medical field. I might not have lasted so long after having to deal with the sick and dying for that length of time.
That HAS to happen to the police too, dealing with nothing but the scum of the earth for a living.
Better them than me.
What was your crusade? Just curious.
My late uncle was a cop for many years. He quit the day he realized he was more comfortable dealing with the scum than with normal people.
He always told me most cops have more empathy for criminals than for civilians. They view the criminals as playing the same game (but from a different side).
It can eat our your soul.