So the two camps are:

spaces: who want to be able to have accidental fractional indentation and so they can force anyone who may read their code in the future to see the indentation at the size that they intended.

tabs: who want consistent bug-resistant and logical formatting, and for any future reader to decided for themselves thier own personal best indentation size.

A possible explanation: people who want it their way at the expense of others are more likely to choose spaces, and are more likely to feel at home at a company that does exactly that in order to extract more profit from thier victi... customers.