I admittedly know very little about Iran's role in Middle East politics, but my understanding is that Soleimani projected his power by building up little armed groups here and there that would act with the confidence that big brother Iran had their back. And if they see that Iran can't stand up for itself, then they'll understandably worry that Iran won't stand up for them either.
Which is my way of speculating that Iran are now compelled to do something to retaliate, even if it would be practically suicidal to do so.
I admittedly know very little about Iran's role in Middle East politics, but my understanding is that Soleimani projected his power by building up little armed groups here and there that would act with the confidence that big brother Iran had their back. And if they see that Iran can't stand up for itself, then they'll understandably worry that Iran won't stand up for them either.
Which is my way of speculating that Iran are now compelled to do something to retaliate, even if it would be practically suicidal to do so.