I think in this case though, others have connected their account, so obviously those that gave him merit doesn't want him to look bad, on the contrary help him boost his account and be accepted in a campaign wherein merit s a requirement.
But I would agree though in your point. Merit can be used as a weapon, I remember one thread from a bounty manager saying he was surprised someone gave him merits and he is somewhat confused or afraid that those giving him merits has bad intentions (ruining his reputation).
I posted analysis of a case of suspected merit abuse here that didn’t get much attention, however it can be used as an example as to how to use the above logic.
Thanks for the link, it was a good and through analysis. Actually I saw another one giving 5 merits to someone, the exact merit requirements to be able to qualify on that campaign. However, as you have said it's hard to prove plus the language barrier as well. The post that was given a merit is not in English so I can be wrong here.
And thanks for those who help find the connection, indeed they are alts but as @Coolcryptovator has said, we need more proofs like joining the same bounty, before he tag these accounts.