Should I worry about bogus route registry entries?

Recent events prompted me to look at a few routing registries for
information on prefixes dear to me. I have to admit that I don't like
what I see. There are quite a few RRs which publish illegitimate
shorter prefixes which cover the ones I'm interested in. A few months
ago, I looked into this issue for other reasons, and had one or two of
them removed, but this is a bit tedious -- especially since some of
the databases are not public and are only revealed by other RRs.

Should I care about this on-paper prefix hijacking? Is it worthwhile
to set up some kind of monitoring? Is there a blacklist of RRs which
are known to deliver mostly bogus data to other RRs?