Actually, I have done my homework and read the Catechism quite a bit, particularly the parts about the sacraments. It provides plenty of support for each of my points:
1. "Deacons are ministers ordained for tasks of service of the Church; **they do not receive the ministerial priesthood,** but ordination confers on them important functions in the ministry of the word, divine worship, pastoral governance, and the service of charity, tasks for which they must carry out under the pastoral authority of their bishop." CCC 1596 (emphasis added).
"At the lower level of the hierarchy are to be found deacons, who receive the imposition of hands 'not unto the priesthood, but unto the ministry.'" CCC 1569.
Nowhere in the Catechism is it said that a deacon is a bishop's "co-worker." By contrast, "the function of the bishops' ministry was handed over in a subordinate degree to priests so that they might be appointed in the order of the priesthood and be *co-workers of the episcopal order* for the proper fulfillment of the apostolic mission that had been entrusted to it by Christ." CCC 1562 (emphasis in original).
No citation should be necessary to show that a deacon has no power to confer Confirmation, Annointing of the Sick, absolution, or Holy Orders, or to confect the Eucharist. A Latin-rite deacon may Baptize and witness a marriage, but so can a layperson (under particular circumstances).
2. Permanent deacons are allowed to hold positions which entail a participation in the exercise of civil power, a position forbidden to priests and bishops. They are also allowed to conduct a business or trade personally for their own advantage or that of others, another ability prohibited to priests and bishops without permission. CIC 285 sec. 3, 286, 288.
These exceptions would not be in place if they did not reflect the ministry of deacons in the world at large, as opposed to the sacramental ministry of the priesthood. "It is not right that we should give up preaching the word of God to serve tables. Therefore, bretheren, pick out from among you seven men of good repute, full of the Spirit and of wisdom, whom we may appoint to this duty. But we will devote ourselves to prayer and to the ministry of the word" Acts 6:2-4
3. Finally, a permanent deacon is not required to wear clerical garb, which is required of bishops and priests. CIC 284, 288.
In any event, the question on this thread is not whether the Code requires or allows the Roman collar for deacons, but whether, in the opinion of the posters, it is appropriate. I, along with 80 others, happen to think it is not, even though deacons provide a valuable service to the Church and it was a great idea to reestablish the ministry.
You may happen to disagree with me, but my opinion does not put me outside the teachings of our Holy Father or Holy Mother Church, does not encourage a "false understanding," does not imply a refusal to accept the church's canon law, and most certainly does not reflect a lack of Christian disposition.