i would consider aiding or abetting hamas to be a serious offence worthy of deportation, but those charges have not been proven in court, nor has he even been charged with them, to my understanding.
you can't just deport people without convicting them of anything, first.
however, if there is evidence, i hope there's a lengthy show trial, that he is convicted on live television and that he's deported with flair. if they actually have evidence of him working with hamas, he should be made an example of.