I also am, however, very pro truth.
Anyone who tells you he can have employees with low or zero productivity, for whatever reason, as select members of a small, highly leveraged startup - is either lying to you, or will fail unless he's extremely lucky not to have such employees.
If your team consists of 3 senior developers, and one of them stops producing, your project will likely be pushed back a third or more over schedule. This can easily kill a startup, since if your idea has any merit at all (which is your only chance of success anyway), then you have ten other teams competing against you to launch first.
I totally agree that employees should be respected and cared for, and that a key employee leaving a startup is generally the startup's fault. However, if someone doesn't work out, he will be let go. Not just by the employer - his co-workers will call for his head, since his problems (whether he's to blame for them, or not) endanger the entire team.