Palm OS phones like the Treo never had any remote kill switch or other such nonsense. Anyone could develop for it and post their apps wherever they pleased. There was no gatekeeper to be be paid or placated, nor were there any super-scary viruses that brought down the network.
If this kind of Orwellian control is "a necessity specially for an open platform", why not allow Linux vendors the same power over your servers and workstations? After all, "imagine if a malicious app got loose and they couldn't do anything about it".
Seriously: it is up to the users to exercise good judgement and safe computing practices. If an infected phone is causing problems, let the carrier disconnect it (just like ISPs disconnect problem accounts). Turning power over to someone else is just another example of the nanny mentality. Not to mention that the back doors themselves may be exploited by malware.