I have and still feel guilt. Maturity has distilled it into being of proper proportion to its source. It can look like rationalizing in order to justify away the guilt, but I try to give a moment to reflect upon it when I think it deserves introspection. I have had to the role of "villain" many times, but it is usually a means to better end once all reflexive resistance has run its course. I don't like having to take the role, but it's nearly always met with meaningful success.
Allow me to share a couple poems fairly relevant to this... (I don't like getting this personal, but I feel it has merit here.)
I could be your weakness
The kind you fight to get strong
You're right and I'm wrong
I'll be a challenge to meet
A villain to defeat
A bad habit to break
Just another mistake
A time in your life that went on
For much too long
Since there was nowhere for me to go
It was up to you to go away, so
You can blame today for tomorrow
But I want you to know
That the only thing in your way
Was you
And I was the one that let you go
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I want to hide
From those eyes
Younger than mine
That shine with innocence
Accepting lies for truth
Who am I
That those eyes
Rely on my right and wrong
Trying to save them early on
From a world they'll find
Turned unkind
Pain isn't gentle
Strife pollutes inside
Hope turns toxic
Love taints judgment
How will they survive?
Truth begs for lies
So kill those eyes
Before they die