webshield question, again

I keep thinking I understand how to determine if a site is safe for me to visit or not... but I keep learning I know nothing.
 
So, my two part question is:
Is the issue that some/many webpages in the domain are very dangerous, but the primary page is not?
If I'm wrong, then please try to explain the discrepancy.  PS, a few years ago it set off all sorts of "alarms" on my system so I won't go there anymore anyway.
 
www.mrexcel.com
Webshield:  Orange Exclamation
Confidence 71
Score 21
 
Clear enough, but I'm about to talk to a group and encourage them to use Webroot and, if not, encourage them to use Brightcloud.
Bright cloud UTL IP says:
Reputation Index:  21  Status Orange Explamation (Suspicious)
 
Web Reputation analysis.
Infections (past 12 months) value :no  impact long green bar  (no infections add positve impact)
Popularity: High  somewhat long green bar (High popluarity add positive impact)
Age: 92 months established, medium green bar (established add positive impact)
 
Real-time intelligence analysis
no threats found
status: trustworthy