Actually, I implied no such thing. First, Scripture clearly indicates tares ARE NOT wheat. They just happen to hanging out in the same field, together, till the end of time. Without doubt, the Church teaches that those who support abortion, for example, by encouraging abortion have, in essence, already excommunicated themselves. Hence, they're tares. Just because they show up in Mass on Sunday doesn't perforce mean they are in communion with the Church.
Now, in certain instances, it may be necessary to avoid those who (usually because of their public status) would bring harm to the Body of Christ through a more public excommunication -just as is recommended in Titus 3:10.
Perhaps you could convince me otherwise if you would offer your own interpretation of the parable of the wheat and the tares.
And that's what hasn't happened.