Is shame always a bad thing?

Toxic shame is bad. 

It's the shame that create our inner voice that tells us we'll never be good enough for anything, we'll never have any worth. 

The pointing fingers.

The constant look down the nose.

The dismissal of your as a relevant part of life.

The putting you on the back burner, and leaving you there.

Healthy shame is good.

The kind of shame that makes you inspired and motivated to change your situation. To grow and to spread into life in a better way. 
The kind that says "you suck right now". Because there's room for growth. The "right now" will change. That moment is gone and you have a chance to make a choice that WON'T suck later. Improvement. Strength. Perseverance comes from this.