Last week I discovered the top ad for bestbuy.com also went to a scam site, tested on multiple PCs in and outside our network environment. I reported it to @bestbuy who confirmed the issue and reported it. In the exact same case, the green link claimed the URL went to bestbuy.com and everything.

From what I can gather, Google actually lets their ad customers lie about URL destinations on their ads so that they can use tracking links and such, and apparently isn't really doing anything to validate that the destination URL is ever actually reached.

Google Ads should be considered harmful, at least until they can guarantee the destination of their ads will match the destination Google Search shows users they are going to.