P.S. I always thought that only DT can influence on reputation by flagging/adding points of trust.
Anyone can create a flag although you would need supports especially from DT members to make the flag active on the users account. The average users support just reflect as a support to the flag but that of DT members influence the outcome of the flag.
To be more precisely, flags are valid if a given number of user in your trustlist support it.
For a type1-flag, that's 1 more supporting than opposing and for a type2/3-flag that's 3 more supporting than opposing.
Since probably the majority of user didn't touch their trust list, DT 1/2 is what counts for them. This also applies to guests.
Generally, it is advised to adjust your trustlist to be less dependent on DT votes.