imputar.

(Del lat. imputāre).


1. tr. Atribuir a alguien la responsabilidad de un hecho reprobable.
http://buscon.rae.es/draeI/

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Note added at 8 hrs (2010-06-19 05:38:30 GMT)
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I take it that it means no-one can be blamed for having a different personal interpretation than others.

This is philosophical jargon, and we have to respect that vocabulary.
For "proliferen" I like the literal "proliferate".

My take of the meaning here (loosely put) is that without a clearly defined philosophical foundation, which would serve as the basis for meaingful scrutiny, it is reasonable to conclude that personal interpretations of just what "reasonability" (yes, it's a word) amounts to in practice will be given free rein.
So here are some suggested solutions for "proliferen inimputablemente":
1) proliferate unchecked by meaningful scrutiny.
or the long, say-it-all option:
2) proliferate unchecked, there being no basis for meaningful scrutiny.
or simply:
4) proliferate without meaningful scrutiny.
For me, "meaningful" and "scrutiny" are the most accurate and philosophically correct terms.

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Note added at 1 día1 hora (2010-06-19 22:44:12 GMT)
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There is also an accurate, but somewhat obscure, one-word solution:
unattributably.
The use of "imputable" in this passage carries the meaning of: attributable, linkable, ascribable.
The personal interpretations may proliferate with no clear basis for attribution, no clear reference point. Attribution here carries both the legal sense and the philosophical sense.
Moral Philosophy Meets Social Psychology: Virtue Ethics and the ... - [ Traducir esta página ]
de G Harman - 1999 - Citado por 188 - Artículos relacionados
are various benefits to a proper appreciation of ways in which ordinary moral thinking rest on the fundamental attribution error. VII.l Philosophy ...
www.jstor.org/stable/4545312 - Similares
The Scottish Parliament - Staff Handbook - Section 4 - [ Traducir esta página ]
25 Sep 2008 ... You must not take part in your official capacity in surveys or research projects, even unattributably, if they deal with attitudes or ...
www.scottish.parliament.uk/corporate/.../spcb-hbook-04.htm - En caché
So, "unattributably" may work just fine.

Pardon the second answer. I've only done this once before.
Liz's reference motivated me to take another look at this. I entered this as a note to my first answer, but such notes are often overlooked. More explanation is there. I believe the speaker is referring to unattributability in regard to philosophical origins, thus the impunity of the personal interpretations to meaningful scrutiny. So it's all of these meanings.