Q:

Why would you talk about people as if they were an object (c'est un/une...)?

Not sure if it's right but I came across a sentence whilst I was revising:
"Laurent est vraiment sportif et costaud. Il joue au football et au rugby pour deux équipes et il s'entraîne plusieurs fois par semaine. C'EST un grand blond aux yeux bleus."
Why would you say "it is"? Would it not be right if it said "Il est grand et blond aux yeux bleus"?

A:

Indeed, it is a richness of our marvelous language :). C' (for Ce) is neutral and you can use it to represent almost everything cited in a preceding sentence (or everyone, Laurent in your case): 
C'est un beau pays.
C'est une belle voiture.
C'est une maison bleue accrochée à la colline.
C'est une grande fille très intelligente.
C'est un petit garçon très gentil. 

No french speaker will consider these sentences as pejorative.
It's true it can be used to assimilate people to an object in order to depreciate them as in :  
Ce type, c'est une racaille !

but that's a special case, not the general rule. 

A:

In this sentence, it is not correct to translate “c'est” by “it is”. The pronoun ce is neutral when it is part of the triptych celui/celle/ce (plural ceux/celles — there is no neutral plural). In this case, it is followed by a relative clause.

Regarde les joueurs de football.   (Look at the football players.)
  Laurent est celui qui est grand et blond.   (Laurent is the (male) one who is tall and blond.)
  Laurence est celle qui est grande et blonde.   (Laurence is the (female) one who is tall and blonde.)
  Ces deux personnes sont celles que je veux te présenter.   (These are the two people that I want to introduce you to.)
  Ce que je veux que tu fasses, c'est aller leur dire bonjour.   (What I want you to do is to go and say hello to them.)  

There is a different usage of ce, as a subject personal pronoun, which is always followed by a form of the verb être. It is used to describe something that has already been mentioned. In this form, ce is used with every gender and number. With verbs other than être, the usual subject personal pronoun (il/elle/ils/elles) is used.

C'est un grand blond.   (He is a tall blond [person].)
  Il est grand et blond.   (He is tall and blond.)
  C'est celui qui est grand et blond.   (He's the one who is tall and blond.)
  C'est le gardien de but.   (He's the goalkeeper. — He's the one who is playing goalkeeper right now.)
  Il est gardien de but.   (He's a goalkeeper. — His normal position is goalkeeper.)
  Et Pierre ? Ce doit être l'ailier gauche.   (What about Pierre? He must be the left winger. — Here the verb is être; doit is perceived as an auxiliary, even though this concept is not very precise in French.)
  Il semble être en forme.   (He seems to be in great shape. — Here ce is impossible because the verb is sembler, not être.)
  C'est celui dont je t'ai parlé.   (He/she's the one I told you about.)
  Regarde ces joueurs/joueuses. Ce sont ceux/celles dont je t'ai parlé.   (Look at these players. They're the ones I told you about.)  

A:

I believe it's more complicated than that, and this actually goes to a similar place as the ser/estar distinction of Spanish.
It's not that French "refers to humans the same as it does objects", but rather that in French, it's borderline invalid syntax to say il est un + noun (when you see it, it's usually in a literary context or feel odd and dated), you have to say Il est + noun, but that construction cannot be used with noun phrases that express inherent qualities. It's prototypically used for occupations (Il est étudiant, by extension il est papa(1), but not, interestingly enough, *il est oncle), implying a degree of temporariness.
Otherwise you have to use either adjectives (il est blond, il est canadien...) or shift to the demonstrative construction (c'est is somewhat parallel to il y a IMO). That construction allows you more flexibility since il est blond, grand et a les yeux bleus is good grammar, but is awkward (you don't get that problem in English, where you can say blue-eyed as an adjective). C'est lumps it all in a convenient noun phrase.
(1) Yes I do find this headline to be improperly worded.

