Why not take the High Road?

I'm not alleging who started the tiff between Trump and Pelosi last night, but both are responsible for not respecting the venue of the State of the Union, by not relating or omitting comments that are a part of the formalities; showing disrespect the Speaker of the House by as I've read (didn't see the speech) in news items, turned his back, refused to shake her hand, and then the public ripping up of the speech. Both IMO failed to show and display any decorum for this national event, by their actions. Shameful!