To your point about people not considering slapping to be violence.
Slapping is unfortunately SO common in Indian cinema and on TV shows. It is an expression of power. It is used to humiliate, put in place, to assert authority...Parents often slap their grown children (!)...and this is considered okay.
In reality, Corporal punishment is pretty common place in families and schools, but I'm happy to report that this is also changing in India, but far more slowly ... people actually find it hard to accept that a few slaps even in the name of disciple is not okay... we still have the victorian attitude of "spare the rod and spoil the child"...
All goes to show why people wold not consider a slap a big deal...sadly.
I must say that its got me thinking how casual and common place violence has become...for us not to even consider it violence!