I can accept your reason partially, but just another question, should Chrome confirm me before remove them all?
> should Chrome confirm me before remove them all?
1. I am sitting at Chrome right now, Version 25.0.1364.152.
2. I choose "Settings".
3. I choose "History".
4. I choose "Clear all browsing data ...". See the ellipsis? That means it won't take any action until I allow it.
5. Next, I see a dialog that says:
Clear all Browsing data
Obliterate the following items from the past hour/day/week/month/etc.:
☑ Clear browsing history
☑ Clear download history
☑ Empty the cache
☑ Delete cookies and other site and plug-in data
☑ Clear saved passwords
☑ Clear saved Autofill form data
☑ Clear data from hosted apps
☑ Deauthorize content licenses
[Cancel] [Clear Browsing Data]
7. At this point, I have the choice to [Cancel] or [Clear Browsing Data]. Nothing happens without my permission.
So tell me -- what Chrome version are you running, that doesn't have a very complete way to alert you to what's going on?
I invite you to go to your Chrome settings page and see if your experience differs, and also say what Chrome version you are running.
So at your behest Chrome deleted what is probably the most common, and commonly misunderstood, everyday security vulnerability, and now you're all mad about it?
The majority of those cookies were ways for advertisers and merchants to track you and your consumer preferences, and violate your privacy. I've heard reports that Amazon shows one set of prices to those with a long record of browsing and purchases in a given product category (a record keyed to browser cookies), and another to someone with no history in that category.
Cookies aren't your data -- cookies are the data of merchants and advertisers. They should be purged regularly.