Big and small

The big cats sleep like the little ones do,
most of the day and the night through.
A big child loves what the little one does,
playing and smiling, all life ever was.

A crowd behaves, like its members act,
while waiting, demonstrating and attacked.
A chain is as strong, as its weakest link,
It´s eventually time to bethink:

Everything huge always starts small
peace, charities, good deeds or a wall.
All things are changed, with little action.
Instead of nothing, do a minor fraction.