I can understand Liverpool's reaction (the players, not the suits) in the sense that, by all accounts, Suarez seems a decent guy off the pitch. He is not having the kinds of personal issues that other enfants terrible seem to have with drugs/alcohol/violence. He simply loses his head on the pitch.
There are other people in football who are doing far worse things and seeing much less punishment. From that perspective I can see why some are upset about the length of the ban. But in the end you can only be responsible for yourself.
The fact that Nigel de Jong went unpunished for snapping legs in half, or that Balkan football gets a weak slap on the wrist for massive, institutional racism is, unfortunately beside the point if you look at things strictly. Luis did what he did, he has not denied it and we all know that the FA, the league and most English fans are unlikely ever to show him a shred of leniency.
I think that the case of Nigel de Jong was a special case to the English game, that so called it's a man's game, stop being a whinny baby. Vinnie Jones hard man, the whole Leeds Utd. of the 1970's, keep playing with sever head wound, Terry Butcher.

The English game was built on this.
Also
From the press at the time.
Nigel de Jong will continue to escape retrospective action for his leg-breaking tackle on Hatem Ben Arfa despite Newcastle United writing to the Football Association today demanding the Manchester City midfielder is banned.
While the City manager, Roberto Mancini, attempted to defend his player, Newcastle requested that the FA make a precedent of the De Jong case by bypassing the rules and issuing, at the very least, an automatic three-match suspension. A club statement said: "Newcastle United have today written a strongly worded letter to the Football Association. The club has asked the FA for the appropriate action to be taken against De Jong for the tackle, which, in the club's opinion, was unnecessary and used excessive force."
The FA, however, is tied by Fifa's rules and, while there is sympathy for Newcastle for losing the Frenchman to a double fracture, there is nothing they can do now the referee, Martin Atkinson, has confirmed he saw the tackle and did not believe at the time it was worthy even of a yellow card. The FA will inform Newcastle that retrospective action was introduced, in essence, to punish off-the-ball incidents that may have been missed by the officials.
http://www.guardian.co.uk/football/2010/oct/05/nigel-de-jong-manchester-city