Liverpool were indeed able to equalize dramatically in the 87th minute by R. Firmino. and of course this draw is a loss for Arsenal. because only getting 1 point from this match has opened up opportunities for Manchester City to get closer to Arsenal.
A draw is not a good result for Arsenal who are looking to stay away from Manchester City in the title race and I agree with you.
Liverpool should have lost because Arsenal's performance was quite good. Arsenal's two early goals, which were created in the 8th and 28th minutes, increasingly showed that Virgil van Dijk was someone who had to be responsible.
It was clear from Gabriel Jesus heading that van Dijk didn't know his main role as a center back.