I'd like to simply say that forbidding a priest to marry is exactly what 1Tim is talking about but I can't say it that simply because the RC priesthood is unscriptural. Lets pretend that an RC "priest" is really just a misguided Christian who wants to enter into the ministry, forbidding him to marry is completely wrong.
Firstly, your interpretation of Scripture is wrong.
Secondly, the Church does not forbid him to marry. If he wants to marry, he can. Its just that the Church will not call him to the priesthood if he does. The Latin Church chooses to take its priests from those who God calls to a celibate life as Jesus and St. Paul encouraged.
Your use of the word "forbidding" is as inappropriate as if I claimed that you were "forbidding" all the women of the world to be your wife because you had already got one and you refused to consider bigamy!