Silencers are often used to hide a longer inner barrel. So what that means is that, just slapping a silencer on won't increase accuracy. But it will allow you to hide a longer inner barrel underneath it, which will increase your accuracy.
Other than that, they are just for show. But that is generally why they exist: for show, and to hide longer inner barrels.
And don't worry about rude comments, this is the newbie tank, its flame proof