Trust system is nothing. I am here for 5 years. You can give negative trust one of a scammer then he creates a new account and scam anyone. Easy. Trust system is just for trusted members gang
Except that most people don't trust a just recently registered user. They may trust a Sr. Member/Legendary, however.
That's why neg trusting him (in case it's needed) is important. Bam, now he needs 775+ activity and 1000 merits in his new account to get as many "reputation" as he had.