Could someone please critique this poem?

“Heart”

Small high-school boy who's come to grief

from football bully, lunch-bread thief,

take heart – in science class you'll shine,

earn scholarships too, down the line;

and his ascendancy won't last:

you're bound for college, he the street;

from tougher thugs he can't run past

he'll there his due comeuppance meet.

As you win wealth with your degree

he'll toil as your Security

while they, your cops, herd dumb wage-slaves

for you until they reach their graves.

But there are some who cages can't

dissuade from dreams, ideals or art -

who, decoyed by recruiters' rant

through chaos, war – will yet keep heart!