It has less to do with whether it malicious intent from the start of building an organization for explicit intent of capturing core infra. It has more to do with how the Government of Israel operates and the legal requests they can make of their citizens and/or veterans.

Perhaps concern over Israeli products should be probably higher than for China as Israel more well known incidents of exploits as a State actor like with Stuxnet, Pegasus or more recently with pagers etc.

China no doubt has their own share of operations but they either have not used them as publicly in a large scale overt operation or been more discreet about it.

Point is the concern is valid just as it would be valid for China.