Full Idea
A realist says of their theories that they can be evaluated according to truth, they aim at truth, their success favours their truth, their unobserved entities probably exist, and they would explain the observable phenomena.
Gist of Idea
Realists say their theories involve truth and the existence of their phenomena
Source
Alexander Bird (Philosophy of Science [1998], Ch.4)
Book Reference
Bird,Alexander: 'Philosophy of Science' [UCL Press 2000], p.124
A Reaction
This seems to me to be the only sensible attitude towards scientific theories, even if they do become confusing down at the level of quantum theory. Theories aim to be true explanations.