Webster disagrees with you
3rd definition
a : to reduce drastically especially in number cholera decimated the population
Kamieniecki's return comes at a crucial time for a pitching staff that has been decimated by injuries. —Jason Diamos
b : to cause great destruction or harm to firebombs decimated the city an industry decimated by recession
Sometimes a symbol is just lines on a piece of paper. Not every one has to have some nefarious meaning just because it may have 1000's of years ago. Kind of like assuming that every single triangle in existence means pedo. Context matters.
Wictor posts some good insights, doesn't take money and is extremely pro-Trump. Just because he doesn't believe in Q doesn't make him persona non grata.