Quickie question

What's the name used for statements which can be used to argue for or
against a point, which seam to conflict but infact are not
incompatible?

Examples include: "The majority of cannabis users do not progress to
harder drugs" -- "The majority of heroin users began as cannabis
users", or alternatively "The people that committed the terrorist act
were all Muslims" -- "Not all Muslims are involved in terrorist
attacks".

In my above examples, the two events might appear to be mutually
exclusive to the casual reader (If most heroin addicts started on
cannabis then weed must lead to harder drug use, right?) It's only
when you examine the two statements that it becomes clear that they're
not mutually exclusive and it's perfectly possible for both statements
to be true.

Is there a technical name for these kind of statements or statistics?

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