Targeting the British during the Mandate was an act of anti-colonization, not unlike other factions that wanted independence from the British at that time, and the Irgun did warn the British before hand but they did not evacuate the hotel which was the central offices of the British Mandate and the Headquarters of the British Army
For every war crime from Jewish side you can always point to a similar one from Arab side, this finger pointing is not useful for anything but spurring more hate and igniting the conflict over and over.
Should you decide to be consistent with your logic, then we quickly arrive at human race also being bad and we can end this circus.
"Hannah Arendt and Albert Einstein, in a letter to The New York Times in 1948, compared Irgun and its successor Herut party to "Nazi and Fascist parties" and described it as a "terrorist, right wing, chauvinist organization" "