Maybe some insight into SSRIs . Without going into pharmaceutical jibber jabber, they work by making Serotonine more readily available. So guess you are just more happy, right? Well besides side effects like erectile dysfunction(see how mumkey points at his dick, when he talks about side effects and going off the meds), nauseau and sleep deprivation they (or most at least) work by accumulation of said medication in your body. So you won't be a-ok after just one week of SSRIs. Needs time for your body to adjust.
Now what happens is, that they have a driving component, which kicks in earlier, than the suppressing component. Meaning, if you have suicidal thoughts or negative thoughts in general, these may be amplified manyfold when you are in the adjustment period. That's why they need close monitoring by psychiatrists that apply them. Thing is, that not every patient reports the same and not every psychiatrist catches all the signals.
Mumkey feeling numb at first in the first video indicated to me he was 'well adjusted' beyond the 'driving effect'.
Now he comes off way more manic, unhinged, and also claims to have gone off his meds two days already. Depending on the product, that could explain his batshit behaviour a bit more, because he feels driven, see the delusions of comparing himself to walter white or the parkland shooter.
Of course just dropping SSRIs is a very bad idea, as one would need to decrease the amount in your blood over time in a controlled manner, to not get fucked over like him..
Does that excuse his behavior? Hell no, he still is a cuck chasing pedo pussy, but him offing himself wouldn't be too uncommon considering his (mis)use of medication in a situation that already made him unstable from the get go. If he goes off of the SSRIs cold turkey for longer, we might see more mental crashes, eventually leading to more destructive behaviour.