Bus tickets are unhelpful because it further uproots their lives. People (including homeless people) have support networks, communities, etc that get destroyed by being forcibly relocated.

They’re human and like all people they build a life over time, they have neighbors and friends and possibly family nearby that love and support them.

There are also annoying logistical challenges to moving that are harder if you’re homeless. Finding a new doctor is hard, harder still if you’re restricted to free or reduced cost clinics. Finding a food bank or getting a PO Box or a church or a job.