Trump before being elected wanted to end the bloodshed. Tulsi Gabbard wanted to end all the "regime change" wars. But after getting into office, these people are completely different. Elon Musk was all for free speech until after he bought Twitter, then he started making exception after exception.

I can think of (at least) five explanations:

1) They saw classified information that was accurate that changed their minds

2) They saw classified information that was inaccurate but deceptively crafted to change their minds

3) They never had their prior stated opinions, they just lied to get into office

4) They are being blackmailed

5) They aren't even the same people - Israel has a top secret look-alike replacement program that kills the original Trump and the original Tulsi and replaces them with look alikes

(5) is the most entertaining explanation.