I think it's also worth remembering that many versions of "bad values" might not be bad faith feigning of good values, but it might be a disagreement over value

I think it's also worth remembering that many versions of "bad values" might not be bad faith feigning of good values, but it might be a disagreement over values (in the same way that you might agree on values, but disagree on ideas as you described). Two people may have different weights on the proper tradeoffs of safety versus liberty, and each might think the other has "bad values" without disagreeing with the others ideas, or thinking they are being dishonest or underhanded in any way.