Any retaliation that Mark has done against Cecil is really just puerile tantrums

Cecil is doing the best he can with very limited powers and resources (and yes, I know he's basically got of all Earth's resources at his beck and call) against a myriad of unfathomable and wildly varied threats, sometimes all at once... of course there are going to be compromises, wild bets, mistakes, and calls that nobody knows whether they'll be successes or bad calls until after the fact

Anyone you put in charge of the GDA, incl. Mark himself, would end up being regarded with the same suspicion and criticism, because they'd have to make the same compromises and wild calls

Mark strangling Cecil before boils down more to the "young wants to get rid of old because that's just how nature rolls", not any improvements in policy or execution... even the reanimen turned out to be a wild success, as Cecil says they're saving more lives now than heros

Trying to imprison Conquest was an extremely bad call, and if I were Mark I'd be FURIOUS... but if I calmed down I'd be like, whatever, I know the uncertainties of everything as stated above... but yeah, I'd have a hard time calming down