Why did Boo Radley save Jem in To Kill a Mockingbird?Any other answer apart from he had a liking for the kids or that he appreciated the...

Although Scout and Jem had never seen Boo Radley, Boo had
certainly been keeping a watch on them. Some of the neighborhood rumors about Boo were
probably true: He did occasionally creep around at night, since he had made contact with
the children before the assault by Bob Ewell (placing the blanket on Scout's shoulders
and by mending Jem's lost pants). Boo had initiated the leaving of gifts in the
knothole, and he watched them from within the Radley house as the children rolled the
tire and played their Boo Radley game on the sidewalk.

Boo
was the children's neighbor, friend and protector--Jem and Scout were "his children,"
too--although it took Scout a long time to recognize this. On that fateful Halloween
night, Boo may have seen the children leave alone and unescorted, and decided to keep
an eye on them. Boo may or may not have even known about the Tom Robinson trial or Bob's
threats against Atticus, but then again, Boo was one surprising
fellow. 

     Boo was our
neighbor...
     Summer, and he watched his children's heart break. Autumn
again, and Boo's children needed him.  (Chapter
31)