The purjury was its own crime , even though it was a lie about Monica Lewinsky , she did not cause the lieing.
Monica did not want to testify, and had a perfect right to remain silent, since she had done nothing illegal. The prosecutors, however, lied to her and told he that she had to testify or was looking at a long jail sentence. Of course THEY were not under oath, so they could lie like immense broadloop wall-to wall carpets.
No one gives a sh*t about this anymore. He was impeached and there was no conviction, so just get on with it.