But on startup, perl is doing something with hashes i presume. Having no working random number generator is a big problem with hashes. Without it, there is a big problem with Denial of Service attacks. A simple use CGI; my $q = CGI->new; or using any other kind of hashes with user-supplied content can be a problem.
So, if getting random numbers doesn't work, it is much better for perl to fail at startup than to fail silently and expose the system to all kinds of security problems.
"I know what i'm doing! Look, what could possibly go wrong? All i have to pull this lever like so, and then press this button here like ArghhhhhaaAaAAAaaagraaaAAaa!!!"