Yes, it is. It’s much more confusing to have DQA votes that don’t relate to the current location, than to have no votes at all. Anyone viewing the observation for the first time would be very puzzled by any disagreeing DQA votes if the current location looks right and there’s no comments suggesting how that situation might have arisen.
Well, the burden of proof seems to be on you there. In what specific way could the DQA vote tallies ever make a significant difference? Can you come up with a non-contrived example? Even if you can, it seems highly unlikely that it would be very common.
In 99.9% of cases, by far the most relevant data for assessing the location are the current observation record details, the community ID, the comments, and the observer’s observation history (i.e. what they were doing at around the same date/time as the current observation, and/or their general pattern of observing).
The current evidence should be assessed purely on its own merits. The perceived motivations and competence of either the prior voters or the observer should never form any part of that. That would risk subjective bias entering into what should always be an objective, scientific assessment.
The opposite seems more clearly the case. The previous votes are a source of actual confusion, since they don’t relate to the current state of the observation. Resetting the votes is an efficient way to speed up the process of removing the casual status of an observation, which in the large majority cases will no longer apply. It’s more productive to focus on that positive outcome than be dictated to by hypothetical bad-faith actors.
In general, the interface should always try to work in favour of those with good intentions. This is the default assumption enshrined in the DQA for every new observation: the votable items all start out with green ticks (but no votes). Thus, when someone edits the location, it’s more consistent to restore the default state.
As suggested by several people earlier, the best way to preserve the context of prior voting is to leave appropriate comments. By themselves, DQA votes are always somewhat ambiguous, since they don’t carry any explanation of exactly why they were made (which is also a weakness of editing histories).