I will not disagree with you that those are all insidious bugs which in other languages would not exist, but I think this only supports dragonchilds point more. Bad programmers in perl are bad programmers in java are bad programmers in COBOL, etc etc etc. All your examples are, IMO, not examples of what is wrong with perl, but what is wrong the individual programmers who wrote them. Sure these particular problems might not exist in Java, but Java has it's own set of "bad programmer" mistakes which can be just as evil to debug and fix.

I don't believe you should blame the language, as much as you should blame the programmer. Disciple and experience would have solved all the problems you mentioned.