You are both right and wrong. First, the anti-trust laws have been crippled by years of concerted effort by the power brokers, For them to be fully effective, we have to first look into our past and roll-back some historical mistakes. We have to reinstate the Glass Seagall Act of 1933 which identified the inherent conflict of interest between Commercial Banks and Investment Banks We have to reverse the 90's decisions on the removal of Position Limits on Futures Contracts. There are lots of other examples, but these would be a fantastic start at empowering anti-trust enforcement.
Perhaps most important is the "you gotta wanna" principle, the DOJ and Attorney Generals of the States has to be motivated to use the laws they have available today to pursue and punish the offenders. We have to vocally support their efforts to bring the big banks to justice and to accept no less than their making every person and family they destroyed whole again.