I have the hardest time hitting somebody as hard as I can.
In one of my first fights me and a senior were arguing after school, he swung his helmet at me and I blocked it, he then proceded to pick me up and throw me on to the pavement

then he was standing there yelling at me asking who I thought I was...

and It was like even though I had every move I wanted to do planned in my head, I didn't want to fight back because of the legal consenquences, I mean he was parked right in front of my house.
It is funny how I thought, I mean... he swung his helmet at me and threw me in to the concrete and I was afraid of hurting him?
I understand that I train more then the average kid. And you, for just being on this forum probably train more then the average adult.
If we were to get in to a fight because of any reason OTHER then self-defence or to protect somebody else...
then we are acting like superman playing football
the hardest thing for me to get over was to NOT fight because of my EGO.
if it is a self-defence situation, and the atacker is truly trying to harm you then I don't see any problem laying him out, even then it is probably a good idea to use minimal force.
(and is there a such thing as a "physical" block? I mean nothing physical is stopping you from hitting the other person, so everything must then be mental)