When you say something like this you really have to realize that there may be some bias here. I think these protestors feel pretty negative about this, I can't imagine that it's for no reason.
The person I'm responding to seems to believe they have NO REASON to be protesting. I'm simply saying that I don't think a bunch of people went and wasted their AM for no good reason.
This leaves an enormous number of reasons. For example, "Buses are, in reality, evil ghosts" is a reason to protest google buses, even if they are good for the environment, city, and employees.
- AFAIK currently the companies don't pay to stop at the MUNI stops.
- A working public transportation system for everyone would be greatly preferred to a system that's only working for employees of certain companies.
- By offering these shuttles companies contribute to more people living in SF, driving up rents (I'm not saying that they shouldn't be allowed to offer this, but it's an argument one could reasonably have)
- These shuttles might actually make an improved public transportation system less likely since none of the Google (and other companies') employees would most likely use it, even if something better than Caltrain existed.
BTW: I'm not generally against these shuttles, but you were asking for arguments against them and I think there are several.