If you are satisfied with Ava Maria's returns then you should follow your conscience.
Some people object to mutual funds which invest in defense industries, gambling, tobacco and liquor.
Personally I withdrew from a fund which invested in a biotech (Genentech) which conducted fetal stem cell research.
With regard to vaccines which were derived from aborted fetuses and the companies which produces and sells them, this document may be helpful.
http://www.immunize.org/concerns/vaticandocument.htm Another website which names pharmaceutical companies (like Merck) which produce illicitly derived vaccines is here:
http://www.rtl.org/prolife_issues/LifeNotes/VaccinesAbortion_FetalTissue.html If you have any questions after reading this material, just ask, either here on the public forum of in a private message.
Deacon Paul Boboige
Pro-Life Office, Archeparchy of Pittsburgh