Allahu Must3aan, what a trial indeed. I can't even begin to imagine how painful this must be for you and your brother. Truly may Allah grant His utmost Mercy on the deceased young brothers and May they enter paradise..Aameen.
Yes people can be extremely harsh in their assumptions. Not only are they quick to tar everyone with the same brush, they would even go as far as celebrating another's tragedy simply because they assumed they must be at fault..Audubillah!