Frankly I would prefer that Biden's too busy right now dealing with this attempted assassination - briefings & updates from Secret Service, etc. than to be worrying about making some sort of superficial statement. Then, after everything has been solved & answered, he and his PR team can focus on making statements.
Right now we have no idea what's going on; is it just a crazy Trump hater, or is something bigger going on, etc.
I'm speaking as someone who has no desire to vote for Biden & I voted for Trump in the last 2 elections.