Lockdown in sector 4!

Just wondering why is Google trying to make GMAIL so very secure just to unknowingly cause inconvenience to its (heavy usage) users? I think if someone is keen on potentially harming the account he/she can simply delete the account and everything will end once and for all.

It should be upto the user to change the password at a frequency dependent on the value and size of data in the account and I feel Google should not worry about this!

Maybe Google thinks it's servers should not be very buzy or some such things, coz otherwise this doesn't make sense. Usually, 'Session Expiration' is done instead of simply disallowing access to an account. Though Google does this in Orkut but I don't know why not in Gmail.

The error text as in the image is as follows:

"Our system indicates unusual usage of your account. In order to protect Gmail users from potentially harmful use of Gmail, this account has been disabled for up to 24 hours.

If you are using any third party software that interacts with your Gmail account, please disable it or adjust it so that its use complies with the Gmail Terms of Use. If you feel that you have been using your Gmail account according to the Terms of Use or otherwise normally, please contact us at gmail-lockdown@google.com to report this problem."