In tiresome tirades tendentious why do sound so pretentious?

Our deluded Prime Mover
acts arrogant & contentious
seeking room to maneuver
with pithy prancing pretentious

Readily spouts what’s trite
mixed with random invective
Blindly claims to be right
while facts, logic deflective

Keeps up tiresome tirades tendentious
but aren’t we all sometimes sententious?

+)
sententious = full of terse pithy sayings & axioms

Pentagon simply cannot ‘under spend’. Hence no peace dividend

The ‘peace dividend’
since fall of Mastodon
seemed a heaven-send
in 1991

But the Pentagon
please try to cotton on
can’t but carry on
needed to bear down on

Despite it’s vainly bloat
it just won’t concede
a single tank, plane, boat
or other war steed

seemed at time providential
turned out inconsequential

+)
-cotton on = understand, or begin to understand
-1991 = the collapse of the Soviet Union (here: Mastodon)

What me yield? Don’t you see I’m large-wheeled?

At those pedestrian crossings striped
cantankerous drivers of ‘tanks’
impatiently stopped, while sometimes griped
about walkers’ deficient thanks

Obsequious must be walkers may
it’s in U.S culture, of course
prevailing attitude holding sway:
Need respect only size & force!

Thus most backward to yield
when we are the large-wheeled

+)
‘tanks’ = here: ever larger cars, SUVs et al