&#62; Such statements also come out of biologists discussing evolution<p>This is only the case when the opposing person is pretending to be a scientist but is really a creationist.  Scientists tend to make arguments based upon facts and experiments.  They start to get really mad when people don't follow the rules and start bringing non-scientific "evidence" into the argument.<p>There is plenty of things up for debate about <i>how</i> evolution works, but these are the details of the theory.  Due to overwhelming evidence, the debate on <i>if</i> is over, however the debate on <i>how</i> is very much alive.