I have been mining here for about 2 years and am a frequent stalker of this board.  I am sure Kano and clgrissom3 have had a response to the upcoming activation of SegWit.  I just haven't seen it.  If someone could link it I would appreciate.  

I know this isn't the correct thread for this, but most people here seem WAY more level headed and thoughtful then rest of the community about this issue.

I have been reading about some of the vulnerabilities of SegWit and how it opens up Bitcoin to security problems (https://calvinayre.com/2017/06/19/bitcoin/risks-segregated-witness-opening-door-mining-cartels-undermine-bitcoin-network/ and how it seems to me that we as miners will be losing transaction fees as most transaction will be done on side chains, then crammed into our at most 2MB block.  

So why in the hell are we activating SegWit?  

And a follow up question then, if we are activating SegWit, when one of these security vulnerabilities is taken advantage of won't it completely destroy the reputation of Bitcoin?

If I am misinformed please link me to the correct info.  Educational material is always appreciated.

Thanks!