Here's a real "Mourner in Chief" showing what he is:
https://www.youtube.com/watch?v=qJcmawIWJ_YThe video is ~4 minutes long, from receiving bodies of soldiers killed in Kabul. The video gives the full time context, with Biden being Biden in the seconds after 1:30.
President Trump, however, was known for visiting recovering service member in Walter Reed
without public announcements or notifying the MSM.
gopiscrap is probably indirectly whining that Trump did not serve in the US military. Consider this contrast: the most recent D POTUS to serve in the US military was Jimmy Carter; the most recent R POTUS not to have served in the US military was Herbert Hoover, a Quaker who in WW1 served in the Wilson Administration's US Food Administration, that managed military and civilian food distribution.
More to the point at hand, keep in mind that had LIEden done this, Dems and other Progs would have praised his decisiveness, cunning, and foreign policy genius. The Dems and their MSM-Parrots are angry that Trump did it, and only for that.