I wasn't cherry picking, I just chose three of the most high profile acts of terrorism - there were many more.
Even Israeli sources recognise that Haganah were a paramilitary group that committed violent acts, so it isn't even something that can be argued as in contention. They may have helped the British capture Irgun and Lehi members for a few months after Moyne was assassinated but through Palmach, they were involved of plenty of acts of terrorism.
Here are just two Israeli based sources that provide examples of Haganah's participation and complicity
From Jewish Virtual Library.org:
"At the end of the war, when it became clear that the British government had no intention of altering its anti-Zionist policy, the Haganah began an open, organized struggle against British Mandatory rule in the framework of a unified Jewish Resistance Movement, consisting of the Haganah, Irgun Zevai Le’umi - Etzel, and Lohamei Herut Yisrael — Lehi. In its most spectacular operation, the combined forces sabotaged British railways throughout Palestine on the “Night Of The Railways.”
and here in respect of the Palmach
For seven months after the assassination of Lord Moyne, members of the Palmach under the command of Shimon Avidan were involved in the “Hunting Season,” in which they cooperated with the British in an attempt to crush the Irgun (Etzel) and Stern Gang (Lehi). Later, however, David Ben-Gurion decided on October 1, 1945, the Jewish fighting forces should unite against the British in what became the Jewish Resistance Movement. On October 10, 1945, the first operation, a raid on the Atlit internment camp that freed 208 “illegal” immigrants held there, was carried out under the leadership of Yitzhak Rabin In November 1945, the movement launching a major attack on railroads across the country and sank several British ships. In the following months, the Movement carried out attacks upon British police posts, coast guard stations, radar installations and air-fields. In June 1946, the Palmach blew up ten of the eleven bridges connecting Palestine to its neighbouring countries.
and from the Jerusalem post:
Many people are convinced that the British might have remained here indefinitely - were it not for violent actions by the underground (Etzel, Lehi, and the Hagana)...
Although the Hagana had sanctioned the King David bombing, world-wide condemnation caused the organization to distance itself from the attack. As a result, the blast signified the end of a period known as the United Resistance, in which the Hagana, Etzel and Lehi more or less worked together in an attempt to oust the British.
Haganah were also aware and in support of Irgun's plans to attack Deir Yassin in the massacre which killed 100+, including women and children, and expelled over 700 people from their homes.
Again from the Jewish Virtual Library:
On April 6, Operation Nachshon was launched to open the road to Jerusalem. The village of Deir Yassin was included on the list of Arab villages to be occupied as part of the operation. The following day Haganah commander David Shaltiel wrote to the leaders of the Lehi and Irgun:
I learn that you plan an attack on Deir Yassin. I wish to point out that the capture of Deir Yassin and its holding are one stage in our general plan. I have no objection to your carrying out the operation provided you are able to hold the village. If you are unable to do so I warn you against blowing up the village which will result in its inhabitants abandoning it and its ruins and deserted houses being occupied by foreign forces....Furthermore, if foreign forces took over, this would upset our general plan for establishing an airfield.2
The Irgun decided to attack Deir Yassin on April 9, while the Haganah was still engaged in the battle for Kastel. This was the first major Irgun attack against the Arabs. Previously, the Irgun and Lehi had concentrated their attacks against the British.
So unless you are going to suggest that blowing up railway infrastructure, sanctioning bombings and massacres, sabotaging and raiding army bases and other violent attacks aren't terrorism, just because of who it was then you are just being disingenuous.
Planning and sanctioning acts of violence and destruction, even if the intent was to only damage infrastructure and not kill people, is still terrorism. Saying, "Ooops, didn't mean to kill anyone" and condemning it after the fact does not, give people a pass, no matter how much you might want it to.