::::::Well, that's not exactly true. Maybe the first time you removed them you thought it was uncontroversial, but what about the second time? My restoring them means at least one person (me) thinks they should be there, so you can see that it is controversial, at which point you should leave them, tag them, and discuss.  
 ::::::And I did NOT say you should delete the source and the material at the same time; I said you need to use {{fact}} tags to ask for better sources.