Does anyone else think it's crazy that we're putting the cop on trial who didn't take on the Parkland Shooter armed with a pistol against the shooter's AR-15?

I don’t understand how anyone thinks his pistol was going to accomplish much against what is essentially a battlefield weapon in semi-auto mode, especially when the officer is worried about safe firing angles while the shooter isn’t. It’s like he’s being scapegoated to justify civilians owning assault weapons, or am I misunderstanding the facts/situation?