Which statement is the "cause" when the following sentences are combined with regard to the position of "for"?1. Superstitions about names persist...

Your choice of using "for" to combine the sentences in a
logical way is correct. The use of the word "for" is similar to using the word
"because."

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[Y]ou can use the word “for” as a conjunction to
mean “because” or
“since.”

You organization of
ideas seems to follow this first pattern: three sentences are similar in that they each
have the word "parent" in them. The only one that does not then becomes the statement
that creates a context for the rest of the "parent" sentences. The next method of
logical organization on your part is found in placing together the "parent sentences"
that are similar, and isolating the one divergent, diametrically opposed "parent"
sentence. In other words, there is a positive reason in the naming of children after two
kinds of people: leaders and entertainers. At the opposite end of the spectrum are names
that are avoided because they are the names of "heinous
criminals."

The basic premise of the thought presented is
that superstitions about names exist. You go on then to support this
general statement with specific
examples—separating them into positive aspects by which parents
choose baby names, and negative aspects that prevent parents from choosing certain
names…and you place "for" in the perfect spot.

It is very
interesting to study this kind of "word problem" in that you look for the general
statement and support it with the specifics— while the specific examples differ greatly
in nature and need to be further "categorized" in relation to each
other, but separated from the general statement they
support.

Nice job!