I do know that there are many pictures uploaded that do not belong to themselves, but Deviantart is a ART website not a look-what-I-found website, that's what Google is for. Deviantart is mend to show the world what you made yourself. (by uploading to deviantart you get free minimum copyrights, this might get you in trouble for theft, still it won't be so bad for demotivational pictures) + admins do not delete this (i think) because they are too lazy for that
Well, we all have an opinion. I don´t make it for money, only for funny and to make people laugh. If you don´t like it, i am sorry but other people like it and laugh.
I found that you made the original pic, but you also have screenshots of videogames in your gallery, isn´t that the same? i think that you don´t have the rights for those videogames but still these screenshots are in your gallery.
Also you have in your gallery of favourites demotivationals with photos of people, isn´t that the same? or do you have rights over the photos of other people?.
PS: I think that your original pic of the Space marine it´s much better than the SPace Stalin that i found.