am i fierce?

just now i sent shin kiat to ground floor by lift.
i scolded two kids that were simply press lift buttons.
i know i'm quite fierce at that time (not only at that time, it's i am fierce at all time)
i couldn't bear with naughty kids that simply playing with lift and affect others.
after we went out from lift, he told me not to be too fierce next time.
okay, i admit i was quite hot-tempered just now.
now i think back, i wonder why just now i get so angry?
it's really no point for me to scolded that two naughty kids...
he is right.
well, i promise you. next time i will be more fondness