The Symbol of Uncleanness

In the Bible, becoming unclean is not wrong. You're not a sinner if you become unclean because you had to bury your grandfather or something. Becoming unclean is a natural part of the cycles of life in human life and so on. After seven days, pass or whatever, you take a bath, go off for sacrifice and you're clean again. That's the way it goes. Except for the guy with a skin disease. Because if that skin disease goes on and it's prolonged he's blocked from all contact. He can't go into the holy space and soon. And so what's wrong is not being unclean, just like having a cold is not