There’s only really 3 options I can think of;
1.It was a stunt someone/they planned for abit of attention or media coverage given the Oscars have been tanking in ratings/popularity over last years - racism, pandemic, Harvey Weinstein, Epstein etc
2. As others have said he’s got a whole lot of pent up rage and psychological stress from years of marital problems and infidelity.
What I think most likely though is
3. (assuming 1 isn’t true) Cocaine. Swinging from aggression to the point of violence and yelling in front of 100’s of people to bawling crying talking about God and Love to singing and dancing within short hours is not normal behaviour. It’s very reminiscent of Kanye level erratic behaviour and we know he’s psychiatrically unwell. So yeah, cocaine, alcohol, uppers , steroids etc will do that to you.