Because killing people for money is an evil act? I mean, I know it's a game and all, but is there not SOME modicum of decency that should be adhered to?
Wouldn't you agree that boiled down a bit, many adventurers accept money in return for going and killing something?
In a world where elves, dwarves and halflings are rubbing shoulders with humans, why would going and killing a kobold and his family be any less of a murder than an assassin creeping into the castle and killing a king?
Besides nowadays there are plenty of examples of heroic assassins around. Assassin's Creed assassin for example. He's far more than just a guy who accepts money to kill people. His acts are politically motivated, vying to restore his family's power and prestige. Sounds like something that would slot perfectly into a game of D&D and nothing inherently evil about it, or at least any more evil than most D&D characters motivations (e.g. I'm going to go to this place and slaughter everyone for they have offended my god! Jeesh ... if that aint evil ....)
How they finally release 5e at this stage isn't the main concern, as first they want to pre-release all this stuff and let us bang around with it all in the playtest and then refine it done to the best product possible. They have already talked about the importance of an entry level product to bring new comers into the game. So there will be something released that won't have ALL the options at once, I'm pretty sure. But that won't happen til they have 5e near perfect.
Also they've talked about putting loads of great tools in the DMs hand. People have been complaining about the inclusion of things (which I find completely absurd). But it sounds to me that things are being included but will be presented in a way that the DM is encouraged to add or discard elements as they see fit til they achieve the kind of game that they think is fun. WHich sounds great.
So personally, as an experienced player that absolutely loves options, the idea that they will be coming out the gate with such a wide and varied range of classes is exciting. Far more exciting than what I had thought would happen, which is that they would release play test game with wizard, fighter, rogue and cleric fullstop.
What is released in the play test may not be what we see released in the official first product neccessarily. But we'll know that if, say teh assassin doesn't make it into the release product, we'll know the class is being developed and is well along the way (if not already complete) and its release is just a question of time, mitigating to a large degree the kind of complaints that occured when warlocks and warlords appeard in PHB1 in 4e as opposed to the barbarian or bard.
Anyway, I'm finding my curiosity begin to grow.