Security :: Remove The Suid Bits From All Programs?

I've searched the forum, but nothing answers my question. We know the security risk posed by suid, sgid.I'm looking to remove the suid bits from all programs that do not absolutely need it.

This command:
find / -type f ( -perm -04000 -o -perm -02000 ) -exec ls -lg {} ;
gave the list below.

For which of these programs can I safely remove the suid bit? I don't want to break my system by modifying a program that the system needs.

-r-sr-xr-x 1 bin 502172 Jan 10 12:36 /usr/local/bin/dccproc
-r-sr-xr-x 1 bin 186683 Jan 10 12:36 /usr/local/bin/cdcc
-r-s--x--x 1 root 23980 Nov 17 00:27 /usr/lib/virtualbox/VBoxNetDHCP
-r-s--x--x 1 root 9896 Nov 17 00:27 /usr/lib/virtualbox/VBoxNetAdpCtl
-r-s--x--x 1 root 23976 Nov 17 00:27 /usr/lib/virtualbox/VBoxSDL

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