A Kohen is more holy than a non-Kohen thus he cannot injure his holiness with tumas meis. A Yisroel doesn’t have that prohibition, since he is less holy than a Kohen, but I think it would be a good idea for a Yisroel to avoid picnicking in a cemetery or to use a cemetery as a shortcut even if it would be longer to go around it. So that example, too, shows that a Yisroel can (and may be best to) avoid a tuma even if it isn’t forbidden to him.
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