Even I, personally, would be very upset that the president of the United States was assassinated. But, that the particular president of the United States that was assassinated was Donald Trump, I would, personally, celebrate, probably, for several months.
He has a devoted fan base which serves as his political base. They would be upset. Furthermore, look at the assassination of Charlie Kirk as an example. Right wing influencers would use his death to further their own goals and for self promotion. He would become a martyr.
For the record I hate the guy and he took my job.