does anyone know why is there a statute of limitations?

[leftyohiolib]

5. yea i saw that i guess more to the point would be

the protections that are set up in the statute should apply to all laws since things like loss of evidence can happen in any crime. or maybe better said none of that matters in cases of homicide so if they can say none of those conditions matter for that type crime shouldn't it be that none of that matters for any crime- crime is crime if someone vandalizes my house and i find out 8 years later who did it. i think they should still be held accountable.
or lets say someone outs a cia operative in wartime should still be held accountable even if it's a decade later