Why is Adobe putting unsolicited crap on my Mac along with Flash?

I downloaded the latest Flash update, 2/5/16, per the request of my Safari browser.  I've been routinely doing this for years, as I trust(ed) the Adobe brand.  Well,  NO MORE!!  Upon completion of the install I started getting non-stop mysterious pop-ups advising me to Scan my mac.  Additionally, I had MacKeeper as a pulldown option on the top of my screen.  I then spent two hours wading through Apple support sites, 1) diagnosing what the hell this thing was, and 2) removing it.  Apple classifies this as malware.  I suppose buried in the fine print of all the stuff one must "Accept" to do the install, may have been notification this stuff was being installed.  I find this dubious at best, and extremely misleading/unethical on the part of Adobe.  Definitely damages their brand reputation in my eyes.  I'll think twice before again using any Adobe product.