I find this strange when searching on Google.
As you can see I am not searching for anything malicious so why do I get this message?
For sure it must be a keyword that is flagged, but who makes these assumptions that makes me look suspicious?

I get this message all the time. If you are using a public wifi (Starbucks, university, etc) or a proxy or VPN service you will get this message.
It has nothing to do with what you are searching, it has to do with the amount of search requests coming from the ISP you are connected to.